Mass of one atom of an element is 6.645 x 10^-23g. How many moles of element are there in 0.320 kg.

Balance the following equations by ion electron method.
i) \({ KMn }O_{ 4 }+{ SnCl }_{ 2 }+HCI\longrightarrow MnCI_{ 2 }+{ SnCI }_{ 4 }+{ H }_{ 2 }O+KCI\)
ii) 
iii) 
iv) 

Balance the following equation using oxidation number method
As₂ S₃ + HNO₃ + H₂O \(\rightarrow\) H₃ AsO₄ + H₂ SO₄ + NO

State and explain pauli exclusion principle.

i) Describe the Aufbau principle.     
ii) What is effective nuclear charge ?

Which contains the greatest number of moles of oxygen atoms
i) 1 mol of ethanol
ii) 1 mol of formic acid
iii) 1 mol of H₂O

How fast must a 54g tennis ball travel in order to have a de Broglie wavelength that is equal to that of a photon of green light 5400\(\overset { 0 }{ A } \) ?

An ion with mass number 37 possesses unit negative charge. If the ion contains 11.1% more neutrons than electrons, Find the symbol of the ion.

Elements a, b, c and d have the following electronic configurations:
a: 1s², 2s², 2p⁶
b: 1s², 2s², 2p⁶, 3s², 3p¹
c: 1s², 2s², 2p⁶, 3s², 3p⁶
d: 1s², 2s², 2p¹
Which elements among these will belong to the same group of periodic table.

Write chemical equation for the following reactions.
i) reaction of hydrogen with tungsten (VI) oxide on heating.
(ii) hydrogen gas and chlorine gas.

Define relative atomic mass.

Calculate the average atomic mass of naturally occurring magnesium using the following data.

Consider the following electronic arrangements for the d⁵ configuration.
(a)

(b)

(c)

which of these represents the ground state

Which ion has the stable electronic configuration? Ni²⁺ or Fe³⁺.

What are isoelectronic ions? Give examples.

40 ml of methane is completely burnt using 80 ml of oxygen at room temperature The volume of gas left after cooling to room temperature is _______.

1 g of an impure sample of magnesium carbonate (containing no thermally decomposable impurities) on complete thermal decomposition gave 0.44 g of carbon dioxide gas. The percentage of impurity in the sample is ______________.

Total number of electrons present in 1.7 g of ammonia is _____.

The energy of light of wavelength 45 nm is _____________.

Two electrons occupying the same orbital are distinguished by ___________

The equivalent mass of a trivalent metal element is 9 g eq^-1 the molar mass of its an hydrous oxide is _____.

Splitting of spectral lines in an electric field is called _____________

In which of the following options the order of arrangement does not agree with the variation of property indicated against it?

If a body of a fish contains 1.2 g hydrogen in its total body mass, if all the hydrogen is replaced with deuterium then the increase in body weight of the fish will be ______________

Find the wrong statement

When 22.4 litres of H₂(g) is mixed with 11.2 litres of Cl₂(g), each at 273 K at 1 atm the moles of HCl (g), formed is equal to ______.

For d-electron, the orbital angular momentum is ___________

Identify the wrong statement.

Zeolite used to soften hardness of water is hydrated _____________

In a closed room of 1000 m³ a perfume bottle is opened up. The room develops smell. This is due to which property of gases _____________

40 ml of methane is completely burnt using 80 ml of oxygen at room temperature The volume of gas left after cooling to room temperature is _______.

The energy of light of wavelength 45 nm is _____________.

What would be the IUPAC name for an element with atomic number 222?

Which of the following statements about hydrogen is incorrect?

For alkali metals, which one of the following trends is incorrect ?

An element X has the following isotopic Composition ²⁰⁰X = 90%, ¹⁹⁹X = 8% and ²⁰²X = 2%. The Weighted average atomic mass of the element X is closet to _________.

The energies E₁and E₂ of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths ie \(\lambda \)₁ and\(\lambda \)₂ will be ___________

The electronic configuration of the elements A and B are 1s², 2s ²,2p⁶,3s² and 1s², 2s²,2p⁵ respectively. The formula of the ionic compound that can be formed between these elements is ___________

Water gas is _____.

Which of the following statements is in correct ?

Rate of diffusion of a gas is ________

All the naturally occurring processes proceed spontaneously in a direction which leads to _______________

At a given temperature and pressure, the equilibrium constant values for the equilibria
\({ 3A }_{ 2 }+{ B }_{ 2 }+2C\overset { { K }_{ 1 } }{ \rightleftharpoons } { 2A }_{ 3 }BC\) and
\({ A }_{ 3 }BC\overset { { K }_{ 2 } }{ \rightleftharpoons } 3/2\left[ { A }_{ 2 } \right] +\frac { 1 }{ 2 } { B }_{ 2 }+C\)
The relation between K₁ and K₂ is ___________

Which of the following concentration terms is/are independent of temperature _____________

In the molecule O_A = C = O_B, the formal charge on O_A, C and O_B are respectively.

Assertion: Two mole of glucose contains 12.044 x 10²³ molecules of glucose
Reason: Total number of entities present in one mole of any substance is equal to 6.02 x 10²²
(a) both assertion and reason are true and the reason is the correct explanation of assertion
(b) both assertion and reason are true but reason is not the correct explanation of assertion
(c) assertion is true but reason is false
(d) both assertion and reason are false

Splitting of spectral lines in an electric field is called _____________

The group of elements in which the differentiating electron enters the anti penultimate shell of atoms are called ___________

Which one of the following statements is incorrect with regard to ortho and para dihydrogen ?

Which of the following compounds will not evolve H₂ gas on reaction with alkali metals ?

The number of water molecules in a drop of water weighing 0.018 g is ________.

Which of the following pairs of d-orbitals will have electron density along the axes ?

Which of the following elements will have the highest electro negativity ____________

Non-stoichiometric hydrides are formed by _____________

sodium is stored in _____________

The oxidation state of a element in its uncombined state is

The electronic configuration of Eu (Atomic no. 63) Gd (Atomic no. 64) and Tb (Atomic no. 65) are ____________

Match the list I with List II and select the correct answer using. the code given below the lists.

The most abundant element in the universe is _________.

Potassium chloride is used as ____________

The K_c for given reaction will be
\(A_{ 2\left( g \right) }+2{ B }_{ \left( g \right) }\rightleftharpoons { C }_{ \left( g \right) }+2D_{ \left( g \right) }\)

Which among the following molecule obeys octet rule?

Which of the following sodium fusion extract of organic compound gives brilliant violet colour with sodium nitroprusside solution?

Which of the following is heterolytic compound?

Which one of the following is an example for free radical initiators ?

Which of the following statement(s) is/are not true about the following decomposition reaction.
2KClO₃ \(\longrightarrow\) 2KCl + 3O₂
(i) Potassium is undergoing oxidation
(ii) Chlorine is undergoing oxidation
(iii) Oxygen is reduced
(iv) None of the species are undergoing oxidation and reduction.

Which of the following provides the experimental justification of magnetic quantum number?

Group 16 constitutes_____family.

Hydrogen combines with carbon monoxide in the presence of copper catalyst will synthesise _____________

Match the list I with List II and select the correct answer using. the code given below the lists.

Identify the correct statement(s) with respect to the following reaction :
Zn + 2HCl \(\longrightarrow\) ZnCl₂ + H₂
(i) Zinc is acting as an oxidant
(ii) Chlorine is acting as a reductant
(iii) Hydrogen is not acting as an oxidant
(iv) Zn is acting as a reductant

22 g of a gas occupies 11.2 litres of volume at STP. The gas is _______________

The speed of light is 3 x 10¹⁷ nms ^-1. Which is the closest to the wavelength in nanometer of a quantum of light with frequency of 6 x 10¹⁵ s^-1?

Characteristic of transition elements is incomplete ____________

Which of the following elements were unknown at that time of Mendeleev?

Identify the correct statement(s) with respect to the following reaction :
Zn + 2HCl \(\longrightarrow\) ZnCl₂ + H₂
(i) Zinc is acting as an oxidant
(ii) Chlorine is acting as a reductant
(iii) Hydrogen is not acting as an oxidant
(iv) Zn is acting as a reductant

The mass of one mole of CaCl₂ is _____________.

Mass number is equal to the ________

What are the values of n, I, m and s for 3p_x electron?

The longest form of periodic table was constructed by______

The oxidation number of Cr in Cr₂O₇^2- _______ is

The value of Avogadro Number N is equal to ___________.

The radius of which of the following is same as that of the first Bohr orbit of hydrogen atom?

The element with atomic number 31 belongs to _____

Hydrogen accepts an electron to attain the inert gas configuration. In this way it resembles __________

Consider the following statements
i) Matter possesses mass.
ii) 22-carat gold is a mixture.
iii) Dry ice is a compound.
Which of the following statement(s) given above is/ are correct?

Which one of the following orbitals is spherical in shape?

Law of triad was unable to explain for the element

In the following the element with the highest ionisation energy is _______

Hydrogen is used in _________

Assertion (A): Among halogens fluorine is the best oxidant.
Reason (R): Fluorine is the most electronegative atom.
Codes:
(a) both assertion and reason are true and the reason is the correct explanation of assertion
(b) both assertion and reason are true but reason is not the correct explanation of assertion
(c) assertion is true but reason is false
(d) both assertion and reason are false

In redox reaction which of the following Is true?

Which of the following conclusions could not be derived from Rutherford's \(\alpha\)-particle scattering experiment? 

Considering Bohr's model which of the following statements is correct?

The general electronic configuration of p-block element is _____

The change in the oxidation number of S in H₂S and SO₂,in the following industrial reaction:
2H₂S_(g) + SO_2(g) \(\longrightarrow\) 3S_(s) + H2O_(g)

Assertion: Equal volumes of all the gases do not contain equal number of atoms
Reason: Atom is the smallest particle which takes part in chemical reactions.
Codes:
(a) Both assertion and reason are correct and reason is the correct explantion for assertion
(b) Both assertion and reason are correct but reason  is not the correct explantion for assertion
(c) Assertion is true but reason are false
(d) Both assertion and reason are false

Excluding hydrogen and helium, the smallest element in the periodic table is _____

The products formed during the cracking long chain hydrocarbon C₆H₁₂ are _____________

The main pigment in plants is chlorophyll which contains ________

Identify the correct statement(s) with respect to the following reaction :
Zn + 2HCl \(\longrightarrow\) ZnCl₂ + H₂
(i) Zinc is acting as an oxidant
(ii) Chlorine is acting as a reductant
(iii) Hydrogen is not acting as an oxidant
(iv) Zn is acting as a reductant

The number of nodes in s orbital of any energy level is equal to _________

Which one of the quantum number is used to calculate the angular momentum of an atom?

Pick the incorrect statement about the factors affecting ionization energy

What is the electronic configuration of the elements of group 14?

Assertion: Two mole of glucose contains 12.044 x 10²³ molecules of glucose
Reason: Total number of entities present in one mole of any substance is equal to 6.02 x 10²²
(a) both assertion and reason are true and the reason is the correct explanation of assertion
(b) both assertion and reason are true but reason is not the correct explanation of assertion
(c) assertion is true but reason is false
(d) both assertion and reason are false

The change in the oxidation number of S in H₂S and SO₂,in the following industrial reaction:
2H₂S_(g) + SO_2(g) \(\longrightarrow\) 3S_(s) + H2O_(g)

Which form of based on physical characteristics possess neither definite volume nor definite shape?

If a beaker holds 576g of water, what will be the gram molecules of water in that beaker?

Match the list-I with list-II and select the correct answer using the code given below the lists

Which of the following compound(s) has /have a percentage of carbon same as that in ethylene (C₂H₄)?

Atomicity of nitrogen is __________.

The empirical formula of Alkene is _______________

Which of the following does not represent the mathematical expression for the Heisenberg uncertainty principle?

\({ \Psi }^{ 2 }\) = 0 represents:

Which of the following is not a general characteristic of equilibrium involving physical process ___________

\(A+B\rightleftharpoons C+D,{ k }_{ c }\)for this reaction is 10. If c 1, 2, 3, 4 mole/litre of A, B, C and D respectively are present in a container at 25°C, the direction of reaction will be ____________

H₂ + S ⇌ H₂S + energy. In this reversible reaction, select the factor which will shift the equilibrium to the right.

The K_H for the solution of oxygen dissolved in water is 4\(\times\)10⁴ atm at a given temperature. If the partial pressure of oxygen in air is 0.4 atm, the mole fraction of oxygen in solution is ________

Statement I: Acetic acid deviates from ideal behaviour.
Statement II: Acetic acid exists as a dimer by forming inter molecular hydrogen bonds and hence deviates from Raoult's law.

Equimolar concentrations of H₂ and I₂ are heated to equilibrium in a 1 litre flask. What percentage of initial concentration of H₂ has reacted at equilibrium if rate constant for both forward and reverse reactions are equal ____________

Statement I: In dissociation of PCI₅ to PCl₃ and Cl₂,K_p> K_c
Statement II : In dissociation of PCI₅, ∆n_g = -ve and so K, > K_c

Statement I. Addition of an inert gas at constant volume has no effect on equilibrium.
Statement II. When an inert gas is added, the total number of moles of gases present in the container increases and total pressure also increases, the partial pressure of the products and reactants are unchanged.

In the reaction N₂ + 3H₂ ⇌ 2NH₃ + x kCal, one mole of N₂ reacts with 3 moles of H₂ at equilibrium. Then the value of ∝ (degree of dissociation) is approximately ________. P is the pressure at equilibrium 

Which one of the following gases has the lowest value of Henry's law constant ?

An element X has the following isotopic Composition ²⁰⁰X = 90%, ¹⁹⁹X = 8% and ²⁰²X = 2%. The Weighted average atomic mass of the element X is closet to _________.

When 22.4 litres of H₂(g) is mixed with 11.2 litres of Cl₂(g), each at 273 K at 1 atm the moles of HCl (g), formed is equal to ______.

Fe2 + \(\longrightarrow\) Fe³⁺ + e^- is a ________ reaction.

Among the three metals, zinc, copper and silver, the electron releasing tendency decreases in the following order.

Match the list-I with list-II and select the correct answer using the code given below the lists.

An element X has the following isotopic Composition ²⁰⁰X = 90%, ¹⁹⁹X = 8% and ²⁰²X = 2%. The Weighted average atomic mass of the element X is closet to _________.

Carbon forms two oxides, namely carbon monoxide and carbon dioxide. The equivalent mass of which element remains constant ?

The number of water molecules in a drop of water weighing 0.018 g is ________.

Fe2 + \(\longrightarrow\) Fe³⁺ + e^- is a ________ reaction.

Which one of the following represents 180 g of water ?

Two electrons occupying the same orbital are distinguished by ___________

The number of nodes in s orbital of any energy level is equal to _________

Which one of the following orbitals is spherical in shape?

A macroscopic particle of mass 100 g and moving at a velocity of 100 cm S^-1 will have a de Broglie wavelength of ___________

Match the list I with List II and select the correct answer using the code given below the lists.

According to the Bohr Theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon?

Based on equation E = \(-2.178\times { 10 }^{ -18 }J\left( \frac { { Z }^{ 2 } }{ { n }^{ 2 } } \right) \)certain conclusions are written. Which of them is not correct?

The maximum number of electrons in a sub shell is given by the expression _____________

Consider the following statements and pick the incorrect statement(s).
1. Schrodinger wave equation is used to determine the probability of finding a electron at a given point in space.
2. The energy of a electron at infinity is positive
3. Angular momentum quantum number gives information regarding subshells.

As per Aufbau principle, arrange the orbitals in increasing order of energy __________

What would be the IUPAC name for an element with atomic number 222?

The group of elements in which the differentiating electron enters the anti penultimate shell of atoms are called ___________

The first list of 23 chemical elements was published by _____ in the year 1789.

The statement that is not correct for modern classification of element is
(1) The properties of elements are periodic function of these atomic numbers.
(2) The ionisation enthalpy of the elements generally increase with increase in atomic number
(3) For transition elements the 3d orbitals are filled after 3p-orbitals and befire 4s orbitals.
(4) Fifth period contain 18 elements.

Law of octaves was proposed by _____

The electronic configuration of the elements A and B are 1s², 2s ²,2p⁶,3s² and 1s², 2s²,2p⁵ respectively. The formula of the ionic compound that can be formed between these elements is ___________

Period of an element is represented by _____ quantum number

Match the list I with List II and select the correct answer using. the code given below the lists.

Which of the following is Dobereiner's triad?

What would be the formula of the compound formed by A and B, where A has the valence 3 and B has the valence 3?

Which of the following statements about hydrogen is incorrect?

If a body of a fish contains 1.2 g hydrogen in its total body mass, if all the hydrogen is replaced with deuterium then the increase in body weight of the fish will be ______________

The cause of permanent hardness of water is due to _____________

A commercial sample of hydrogen peroxide marked as 100 volume H₂O₂, it means that _____________

For decolorisation of 1 mole of acidified KMnO₄, the moles of H₂O₂ required is ___________

Water gas is _____.

Which one of the following is manufactured in Haber's process?

Which of the following is used as desiccants to remove moisture from organic solvents?

Which of the following is used for cutting and welding?

At the temperature conditions of the earth (300K) the OPR of H₂O is _____________

For alkali metals, which one of the following trends is incorrect ?

sodium is stored in _____________

Find the wrong statement

In case of alkali metal halides, the ionic character increases in the order ____________

The product obtained as a result of a reaction of nitrogen with CaC₂ is ___________

Which of the following compounds will not evolve H₂ gas on reaction with alkali metals ?

In which process, fused sodium hydroxide is electrolysed for extraction of sodium ?

Assertion : Generally alkali and alkaline earth metals form superoxides
Reason : There is a single bond between O and 0 in superoxides
a) both assertion and reason are true and reason is the correct explanation of assertion
b) both assertion and reason are true but reason is not the correct explanation of assertion
c) assertion is true but reason is false
d) both assertion and reason are false

Which is the correct sequence of solubility of  carbonates of alkaline earth metals ?

The compound (X) on heating gives a colourless gas and a residue that is dissolved in water to obtain (B). Excess of CO₂ is bubbled through aqueous solution of B, C is formed. Solid (C) on heating gives back X.(B) is ____________

Gases deviate from ideal behavior at high pressure. Which of the following statement(s) is correct for non-ideality?

A bottle of ammonia and a bottle of HCI connected through a long tube are opened simultaneously at both ends. The white ammonium chloride ring first formed will be ___________

The table indicates the value of van der Waals constant 'a' in (dm³)² atm. mol^-2.

The gas which can be most easily liquefied is ______________

Four gases P, Q, R and S have almost same values of 'b' but their 'a' values (a, b are Vander Waals Constants) are in the order Q < R < S < P. At a particular temperature, among the four gases the most easily liquefiable one is __________

When an ideal gas undergoes unrestrained expansion, no cooling occurs because the molecules _____________

The temperatures at which real gases obey the ideal gas laws over a wide range of pressure is called ____________-

The value of universal gas constant depends upon __________

Use of hot air balloon in sports at meteorological observation is an application of __________________

Consider the following statements
i) Atmospheric pressure is less at the top of a mountain than at sea level
ii) Gases are much more compressible than solids or liquids
iii) When the atmospheric pressure increases the height of the mercury column rises.
Select the correct statement

The amount of heat exchanged with surrounding at constant temperature pressure is given by the quantity ______________

In an adiabatic process, which of the following is true ?

An ideal gas expands from the volume of 1 x 10^-3 m³ to 1 x 10^-2 m³ at 300 K against a constant pressure at 1 x 10⁵ Nm^-2. The work done is ______________

The enthalpies of formation of Al₂O₃ and Cr₂O₃ are -1596 kJ and -1134 kJ, respectively. ΔH for the reaction 2AI + Cr₂O₃ ⟶ 2Cr + Al₂O₃ is _______________

If one mole of ammonia and one mole of hydrogen chloride are mixed in a closed container to form ammonium chloride gas, then _____________

All the naturally occurring processes proceed spontaneously in a direction which leads to _______________

Heat of combustion is always ____________

C(diamond) ) ⟶ C(graphite), ΔH = -ve, this indicates that ___________

Change in internal energy, when 4 kJ of work is done on the system and 1 kJ of heat is given out by the system is ______________

The value of ΔH for cooling 2 moles of an ideal monatomic gas from 125° C to 25° C at constant pressure will be [given C_p = \(\frac{5}{2}\)R] ____________.

If K_b and K_f for a reversible reactions are 0.8 x 10^–5 and 1.6 x 10^–4 respectively, the value of the equilibrium constant is __________

Solubility of carbon dioxide gas in cold water can be increased by ____________

K₁ and K₂ are the equilibrium constants for the reactions respectively.
\({ N }_{ 2 }(g)+{ O }_{ 2 }(g)\overset { { K }_{ 1 } }{ \rightleftharpoons } 2NO(g)\)
\(2NO(g)+{ O }_{ 2 }(g)\overset { { K }_{ 2 } }{ \rightleftharpoons } { 2NO }_{ 2 }(g)\)
What is the equilibrium constant for the reaction NO₂(g) ⇌ ½N₂(g) + O₂(g)

Equimolar concentrations of H₂ and I₂ are heated to equilibrium in a 1 litre flask. What percentage of initial concentration of H₂ has reacted at equilibrium if rate constant for both forward and reverse reactions are equal ____________

A 20 litre container at 400 K contains CO₂ (g) at pressure 0.4 atm and an excess of SrO (neglect the volume of solid SrO). The volume of the container is now decreased by moving the movable piston fitted in the container. The maximum volume of the container, when pressure of CO₂ attains its maximum value will be: Given that: SrCO₃ (S) ⇌ SrO (S) + CO₂(g)
KP = 1.6 atm

\({K_c\over K_p}\) for the reaction,
N₂(g) + 3H₂(g) ⇌ 2NH₃(g) is ___________

In which of the following equilibrium, K_P and K_C are not equal ?

The values of K_P1 and K_P2 for the reactions
X ⇌ Y + Z
A ⇌ 2B are in the ratio 9 : 1 if degree of dissociation and initial concentration of X and A be equal then total pressure at equilibrium P₁ and P₂ are in the ratio __________

In a chemical equilibrium, the rate constant for the forward reaction is 2.5 \(\times\)10² and the equilibrium constant is 50. The rate constant for the reverse reaction is ____________

The equilibrium constants of the following reactions are:

The equilibrium constant (K) for the reaction ;
\({ 2NH }_{ 3 }+5/2{ O }_{ 2 }\overset { K }{ \rightleftharpoons } 2NO+{ 3H }_{ 2 }{ O },\) will be

The molality of a solution containing 1.8g of glucose dissolved in 250 g of water is _____________

Which one of the following gases has the lowest value of Henry's law constant ?

According to Raoults law, the relative lowering of vapour pressure for a solution is equal to __________

The empirical formula of a nonelectrolyte(X) is CH₂O. A solution containing six gram of X exerts the same osmotic pressure as that of 0.025 M glucose solution at the same temperature. The molecular formula of X is ____________

Normality of 1.25M sulphuric acid is ___________

The partial pressure of nitrogen in air is 0.76 atm and its Henry's law constant is 7.6 x 10⁴ atm at 300K. What is the mole fraction of nitrogen gas in the solution obtained when air is bubbled through water at 300K ?

Which one of the following is incorrect for ideal solution ?

P₁ and P₂ are the vapour pressures of pure liquid components, 1 and 2 respectively of an ideal binary solution if x₁ represents the mole fraction of component 1, the total pressure of the solution formed by 1 and 2 will be ____________

200ml of an aqueous solution of a protein contains 1.26g of protein. At 300K, the osmotic pressure of this solution is found to be 2.52 x 10^–3 bar. The molar mass of protein will be (R = 0.083 L bar mol^–1 K^–1)_______________

Assertion: An ideal solution obeys Raoults Law
Reason: In an ideal solution, solvent-solvent, as well as solute-solute interactions, are similar to solute-solvent interactions.
a) both assertion and reason are true and reason is the correct explanation of assertion
b) both assertion and reason are true but reason is not the correct explanation of assertion
c) assertion is true but reason is false
d) both assertion and reason are false

In which of the following Compounds does the central atom obey the octet rule ?

Assertion: Oxygen molecule is paramagnetic.
Reason: It has two unpaired electron in its bonding molecular orbital.
a) both assertion and reason are true and reason is the correct explanation of assertion
b) both assertion and reason are true but reason is not the correct explanation of assertion
c) assertion is true but reason is false
d) Both assertion and reason are false

In ClF₃, NF₃ and BF₃ molecules the chlorine, nitrogen and boron atoms are ______

Which of these represents the correct order of their increasing bond order _________

The correct order of O-O bond length in hydrogen peroxide, ozone and oxygen is _______

Which one of the following is the likely bond angles of sulphur tetrafluoride molecule ?

According to Valence bond theory, a bond between two atoms is formed when _____________

Hybridisation of central atom in PCl₅ involves the mixing of orbitals __________

Which one of the following is diamagnetic ?

Shape and hybridisation of IF₅ are ________

Select the molecule which has only one \(\pi\) bond.

The general formula for alkadiene is ____________

The IUPAC name of the compound CH₃ – CH = CH – C ≡ CH is _________

The IUPAC name of the compound \({ H }_{ 3 }C-\overset { \underset { | }{ { CH }_{ 3 } } }{ \underset { \overset { | }{ { CH }_{ 3 } } }{ C } } -CH=C{ \left( { CH }_{ 3 } \right) }_{ 2 }\) is _____________

The IUPAC name of the compound  \({ CH }_{ 3 }-\underset { \overset { | }{ OH } }{ CH } -COOH\) is _____________

In the hydrocarbo \(\overset { 7 }{ { CH }_{ 3 } } -\overset { 6 }{ { CH }_{ 2 } } -\overset { 5 }{ CH } =\overset { 4 }{ CH } -\overset { 3 }{ { CH }_{ 2 } } -\overset { 2 }{ C } =\overset { 1 }{ CH } \) the state of hybridisation of carbon 1,2,3,4 and 7 are in the following sequence.

Which one of the following names does not fit a real name?

IUPAC name of \({ CH }_{ 3 }-\overset { \underset { | }{ H } }{ \underset { \overset { | }{ { C }_{ 2 }{ H }_{ 5 } } }{ C } } -\overset { \underset { | }{ { C }_{ 4 }{ H }_{ 9 } } }{ \underset { \overset { | }{ { CH }_{ 3 } } }{ C } } -{ CH }_{ 3 }\) is ________

The IUPAC name of the compound  is ____________

The IUPAC name of  is ____________

For the following reactions
(A) CH₃CH₂CH₂Br + KOH → CH₃ - CH = CH₂ +KBr + H₂O
(B) (CH₃)₃CBr + KOH → (CH₃)₃ COH + KBr
(C) 
Which of the following statement is correct ?

Homolytic fission of covalent bond leads to the formation of ___________.

Which of the group has highest +I effect ?

-I effect is shown by ____________.

Assertion : Tertiary Carbocations are generally formed more easily than primary Carbocations ions.
Reason : Hyper conjugation, as well as inductive effect due to additional alkyl group, stabilize tertiary carbonium ions.
(a) both assertion and reason are true and reason is the correct explanation of assertion.
(b) both assertion and reason are true but reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false
(d) Both assertion and reason are false

What is the hybridisation state of benzyl carbonium ion ?

Which of the following species is not electrophilic in nature ?

Hyper Conjugation is also known as ___________.

Which of the following species does not exert a resonance effect ?

Which of the following carbocation will be most stable ?

The correct statement regarding the comparison of staggered and eclipsed conformations of ethane is (NEET)______________

In the following reaction,

The major product obtained is ________

The compounds formed at anode in the electrolysis of an aquous solution of potassium acetate are __________

The compound that will react most readily with gaseous bromine has the formula (NEET)_____________

Which among the following alkenes on reductive ozonolysis produces only propanone?

The correct statement regarding the comparison of staggered and eclipsed conformations of ethane is (NEET)______________

In the following reaction,

The major product obtained is ________

The compounds formed at anode in the electrolysis of an aquous solution of potassium acetate are __________

The compound that will react most readily with gaseous bromine has the formula (NEET)_____________

Which among the following alkenes on reductive ozonolysis produces only propanone?

The IUPAC name of  is ____________

Arrange the following compounds in increasing order of their density
A) CCl₄
B) CHCl₃
C) CH₂Cl₂
D) CH₃Cl

In the reaction  X is ________.

The treatment of ethyl formate with excess of RMgX gives ____________

The name of C₂F₄Cl₂ is ___________

Of the following compounds, which has the highest boiling point?

C -X bond is strongest in __________

Benzene reacts with Cl₂ in the presence of FeCl₃ and in absence of sunlight to form ________

Assertion: In mono haloarenes, electrophilic substitution occurs at ortho and para positions.
Reason: Halogen atom is a ring deactivator.
Codes:
(i) If both assertion and reason are true and reason is the correct explanation of assertion.
(ii) If both assertion and reason are true but reason is not the correct explanation of assertion.
(iii) If assertion is true but reason is false.
(iv) If both assertion and reason are false.

Freon-12 is manufactured from tetrachloro methane by ____________

The gaseous envelope around the earth is known as atmosphere. The region lying between an altitudes of 11 - 50 km is __________.

The pH of normal rain water is ________

Identify the wrong statement in the following __________.

Release of oxides of nitrogen and hydrocarbons into the atmosphere by motor vehicles is prevented by using __________.

Match the List I with List II and select the correct answer using the code given below the lists.

Photo chemical smog formed in congested metropolitan cities mainly consists of ___________

Ozone depletion will cause ___________.

Living in the atmosphere of CO is dangerous because it __________.

Biochemical oxygen Demand value less than 5 ppm indicates a water sample to be ______.

Assertion (A) : Excessive use of chlorinated pesticide causes soil and water pollution.
Reason (R) : Such pesticides are non-biodegradable.
i) Both (A) and R are correct and (R) is the correct explanation of (A)
ii) Both (A) and R are correct and (R) is not the correct explanation of (A)
iii) Both (A) and R are not correct
iv) (A) is correct but( R) is not correct

Total number of electrons present in 1.7 g of ammonia is _____.

Identify the correct statement(s) with respect to the following reaction :
Zn + 2HCl \(\longrightarrow\) ZnCl₂ + H₂
(i) Zinc is acting as an oxidant
(ii) Chlorine is acting as a reductant
(iii) Hydrogen is not acting as an oxidant
(iv) Zn is acting as a reductant

Which one of the following is the standard for atomic mass?

How many grams are contained in 1 gram atom of Na?

When methane is burnt in oxygen to produce CO₂ and H₂O, the oxidation number of carbon changes by ____________.

If the energy of an electron in the second Bohr orbit of H-atom is -E, what is the energy of the electron in the Bohr's first orbit?

Match the list I with List II and select the correct answer using. the code given below the lists.

The number of d- electrons in Fe⁺² (Z = 26) is not equal to the number of electrons in which one of the following?

Which one of the following is called halogen family?

Consider the following statements.
(i) Oxidation character increases from left to right in a period.
(ii) Reducing character increases from left to right in a period.
(iii) Metallic character increases from left to right in a period.
Which of the above statement is/are not correct?

Assertion: Two mole of glucose contains 12.044 x 10²³ molecules of glucose
Reason: Total number of entities present in one mole of any substance is equal to 6.02 x 10²²
(a) both assertion and reason are true and the reason is the correct explanation of assertion
(b) both assertion and reason are true but reason is not the correct explanation of assertion
(c) assertion is true but reason is false
(d) both assertion and reason are false

The oxidation number of oxygen in O₂ is__________

Identify the correct statements with reference to the given reaction
P₄ + 3OH^- + 3H₂O \(\longrightarrow\) PH₃ + 3H₂PO₂^-
(i) Phosphorous is undergoing reduction only
(ii) Phosphorous is undergoing oxidation only
(iii) Phosphorous is undergoing both oxidation and reduction.
(iv) Hydrogen is undergoing neither oxidation nor reduction.

Consider the following statements
i) Matter possesses mass.
ii) 22-carat gold is a mixture.
iii) Dry ice is a compound.
Which of the following statement(s) given above is/ are correct?

The characteristic feature of orderly arrangement of molecules belongs to ______________.

7.5 g of a gas occupies a volume of 5.6 litres at 0° C and 1 atm pressure. The gas is ________.

Rusting of iron articles is an example of ___________ reaction

Which of the following is a mono-atomic molecule?

The oxidation number of Cr in K₂Cr₂O₇ is ___________.

The number of nodes in s orbital of any energy level is equal to _________

How many molecules of hydrogen is required to produce 4 moles of ammonia?

The molar mass of Na₂SO₄ is ___________.

Shape of an orbital is given by ____________

Assertion (A): Angular momentum of an electron in an atom is quantized
Reason (R): In an atom only those orbits are permitted in which angular momentum of the electron is natural number multiple of \(\frac { h }{ 2\pi } \)
Codes:
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not the correct explanation of A
(c) A is true but R is false
(d) Both A and R are false

Consider the following statements.
(i) The region where the probability density of electron is zero, called nodal surface.
(ii) The probability of finding the electron is independent of the direction of the nucleus.
(iii) The number of radial nodes is equal to n + 1+ 1
Which of the above statements is/are correct?

Which one of the following is the standard for atomic mass?

Consider the following statements
1. \(\lambda\) = h / mv is valid only when the particle travels at speed much less than the speed of light.
2. Einstein's mass-energy relationship is E = mc²
3. The angular momentum (mvr) ofthe electron must be equal to an integral multiple of h/4\(\pi\) . Which of the following statements) given above is/ are correct?

Assertion: Helium has the highest value of ionization energy among all the elements known
Reason: Helium has the highest value of electron affinity among all the elements known.
Codes:
(a) Both assertion and reason are true and reason is correct explanation for the assertion.
(b) Both assertion and reason are true but the reason is not the correct explanation for the assertion
(c) Assertion is true and the reason is false
(d) Both assertion and the reason are false

Which of the following statements are correct?
(i) Helium has the highest first ionisation enthalpy
(ii) Chlorine has less electron affinity than fluorine
(iii) Ne has more ionisation energy than Boron.
(iv) The ionisation energy noble gases of zero

Which one of the following is the first transition series?

Presence of which cation makes the water hard in nature?

Which of the following is produced by bombardment of neutrons with lithium?

Hydrogen combines with carbon monoxide in the presence of copper catalyst will synthesise _____________

Rubidium belongs to______group of metals

Which of the following oxides is the most basic in nature?

Hot concentrated sulphuric acid is a moderately strong oxidizing agent. Which of the following reactions does not show oxidising behaviour ?

Which of the following pairs of d-orbitals will have electron density along the axes ?

Which of the following expressions represents the electron probability function?

Which of the following elements will have the highest electro negativity ____________

The most electronegative element of the periodic table is _______

Atomicity of nitrogen is __________.

The maximum number of electrons in a sub shell is given by the expression _____________

Consider the following statements.
(i) The region where the probability density of electron is zero, called nodal surface.
(ii) The probability of finding the electron is independent of the direction of the nucleus.
(iii) The number of radial nodes is equal to n + 1+ 1
Which of the above statements is/are correct?

Pd has exceptional electronic configuration of 4d¹⁰ 5s⁰ It belongs to period ______ and group _____

Find the incorrect statement.

The equivalent mass of a trivalent metal element is 9 g eq^-1 the molar mass of its an hydrous oxide is _____.

Match list I with list II and identify the correct code.

One 'U' stands for the mass of ______________.

How many moles of magnesium phosphate Mg₃(PO₄)₂ Will Contain 0.25 moles of oxygen atoms?

How many electrons in an atom with atomic number 105 can have (n + 1) = 8 ? 

Consider the following statements.
(i) d-block elements show variable oxidate states.
(ii) Mostly d-block elements form colourless compounds.
(iii) Mostly d-block elements are diamagnetic due to paired electrons.
Which of the above statement is/are not correct?

Which of the following is not a periodic property?

FeSO₄ contains _________ molecules of water of hydration.

Consider the following statements.
(i) Silver, Gold, Mercury and Platinum do not have any effect on water.
(ii) Carbon, Sulphur and Phosphorous do not react with water.
(iii) Beryllium reacts with water less violently.
Which of the following statements is/are not correct?

Assertion : Beryllium compounds are covalent in nature
Reason : The size of Be²⁺ ion is larger in comparison to the radii of the other divalent ions of alkaline earth metals.
Codes:
a) both assertion and reason are true and reason is the correct explanation of assertion
b) both assertion and reason are true but reason is not the correct explanation of assertion
c) assertion is true but reason is false
d) both assertion and reason are false

Two electrons occupying the same orbital are distinguished by ___________

Halogens belong to the _____________

In the modern periodic table, the period indicates the value of____

Various successive ionisation enthalpies (in kJ mol^-1) of an element are given below.

The element is

In which of the following reactions H₂O₂ act as a reducing agent?
(i) H₂O₂ + 2H⁺ + 2e \(\rightarrow\) 2H₂O
(ii) H₂O₂ - 2e \(\rightarrow\) O₂ + 2H⁺
(iii) H₂O₂ + 2e \(\rightarrow\) 2OH^-
(iv) H₂O₂ + 2OH^- - 2e \(\rightarrow\) O₂ + 2H₂O

Assertion: The atomic masses of most of the elements. are in the fraction. 
Reason:  The atomic mass represents the ratio of the average mass of the atom to one avogram.
Codes:
(a) Both assertion and reason are correct and the reason is the correct explanation for assertion
(b) Both assertion and reason are correct but the reason is not the correct explanation for an assertion
(c) Assertion is true but reason are false
(d) Both assertion and reason are false

One mole of CO₂ contains __________.

Which of the following electronic configuration represent the element in ground state?

J. J. Thomson's cathode ray experiment revealed that atoms consist of _____________

The maximum number of electrons that can be accommodated in N shell is_____________

Consider the following statements regarding Rutherford's \(\alpha\)-ray scattering experiment.
i. Most of the \(\alpha\)-particles were deflected through a small angle.
ii. Some of \(\alpha\)-particles passed through the foil.
iii. Very few \(\alpha\)-particles were reflected back by 180^o.
Which of the above statements is/are not correct.

The element which does not contain a neutron is _____________

Which of the following is named as perhydrol and used as an antiseptic?

Which of the following is insoluble in water?

Which one of the following is more basic?

Atoms are too small with a diameter of 10^-10 m and weigh approximately ______________.

The fixed circular paths around the nucleus are caused ____

Which of the following is Dobereiner's triad?

The atomic weight of Au is ______

The vertical columns in the periodic table are called as ___________

When 6.3 g of sodium bicarbonate is added to 30 g of the acetic acid solution, the residual solution is found to weigh 33 g. The number of moles of carbon dioxide released in the reaction is _____.

Which of the following is/are true with respect to carbon -12 ?

If a beaker holds 576g of water, what will be the gram molecules of water in that beaker?

In redox reaction which of the following Is true?

Consider the following statements
1. \(\lambda\) = h / mv is valid only when the particle travels at speed much less than the speed of light.
2. Einstein's mass-energy relationship is E = mc²
3. The angular momentum (mvr) ofthe electron must be equal to an integral multiple of h/4\(\pi\) . Which of the following statements) given above is/ are correct?

Unit of Avogadro's number is _______________.

Consider the following statements and pick the incorrect statement(s).
1. Schrodinger wave equation is used to determine the probability of finding a electron at a given point in space.
2. The energy of a electron at infinity is positive
3. Angular momentum quantum number gives information regarding subshells.

Which of the following process is important in food industry?

In chelating method of softening of hard water_______________ is used

Which one of the following is known as Hydrogen sponge?

7.5 g of a gas occupies a volume of 5.6 litres at 0° C and 1 atm pressure. The gas is ________.

How many moles of water is present in 1L of water?

Assertion: The spectrum of He⁺ is expected to be similar to that of hydrogen
Reason: He⁺  is also one electron system.

The orbital diagram in which both the Pauli's exclusion principle and Hund's rule are violated is __________

Which of the following factor decreases across the period?

What is the mass of precipitate formed when 50 ml of 8.5 % solution of AgNO₃ is mixed with 100 ml of 1.865 % potassium chloride solution ?

Which of the following electronic configuration represent the element in ground state?

Electron density in the yz plane of 3d_xy orbital is ___________

J. J. Thomson's cathode ray experiment revealed that atoms consist of _____________

Which of the following is natural and human disturbance in ecology ?

Ozone depletion will cause ___________.

Living in the atmosphere of CO is dangerous because it __________.

Biochemical oxygen Demand value less than 5 ppm indicates a water sample to be ______.

Assertion (A) : Excessive use of chlorinated pesticide causes soil and water pollution.
Reason (R) : Such pesticides are non-biodegradable.
i) Both (A) and R are correct and (R) is the correct explanation of (A)
ii) Both (A) and R are correct and (R) is not the correct explanation of (A)
iii) Both (A) and R are not correct
iv) (A) is correct but( R) is not correct

What will be the basicity of H₃BO₃, which is not a protic acid?

The energy of an electron in the 3rd orbit of hydrogen atom is -E. The energy of an electron in the first orbit will be ___________

Match the list-I and list-II using the correct code given below the list.

Water gas is _____.

Plaster of Paris is obtained by heating gypsum to ______

Equivalent mass of KMnO₄ in acidic medium, concentrated alkaline medium and dilute basic medium respectively are \(M\over5\) , M, M. Reduced products can be __________

Which of the following pairs of d-orbitals will have electron density along the axes ?

Gadolinium belong to 4f series. Its atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?

Water is a ___________

Which of the following are stored under oil?

Identify the correct statement(s) with respect to the following reaction :
Zn + 2HCl \(\longrightarrow\) ZnCl₂ + H₂
(i) Zinc is acting as an oxidant
(ii) Chlorine is acting as a reductant
(iii) Hydrogen is not acting as an oxidant
(iv) Zn is acting as a reductant

A macroscopic particle of mass 100 g and moving at a velocity of 100 cm S^-1 will have a de Broglie wavelength of ___________

On moving from left to right across a period in the periodic table, the metallic character__________.

Zeolite used to soften hardness of water is hydrated _____________

Which one of the following is known as natural insulator?

The compound in which mass percentage of carbon is 75% and that of hydrogen is 25% is _____________.

Based on equation E = \(-2.178\times { 10 }^{ -18 }J\left( \frac { { Z }^{ 2 } }{ { n }^{ 2 } } \right) \)certain conclusions are written. Which of them is not correct?

The first list of 23 chemical elements was published by _____ in the year 1789.

Volume strength of 1.5 N H₂O₂ is _____________

The reducing power of a metal depends on various factors. Suggest the factor. which makes Li, the strongest reducing agent in aqueous solution __________

12 g of carbon-12 contains_____carbon atoms

A macroscopic particle of mass 100 g and moving at a velocity of 100 cm S^-1 will have a de Broglie wavelength of ___________

Electronegativity of the following elements increases in the order

Non-stoichiometric hydrides are formed by _____________

Match the list-I and list-Il using the correct code given below the list.

Identify the incorrect statement about a compound.

The ratio of de Broglie wavelengths of a deuterium atom to that of an \(\alpha\) - particle, when the velocity of the former is five times greater than that of later, is ____________

Which of the following N^3-, O^2-, F^- is largest in size?

Non-stoichiometric hydrides are formed by _____________

Half life of francium is _______

Carbon forms two oxides, namely carbon monoxide and carbon dioxide. The equivalent mass of which element remains constant ?

Two 22.4 litre containers A and B contains 8 g of O₂ and 8 g of SO₂ respectively at 273 K and 1 atm pressure, then ______.

In the reaction to NH₃ + H₂O \(\longrightarrow \) \({ NH }_{ 4 }^{ + }+O\overline { H } \), NH₃ is acidic in. the reason for its acidic is_____ 

7.5g of a gas occupy 5.6 litres of volume at STP. The gas ____________

The energy of an electron in the 3rd orbit of hydrogen atom is -E. The energy of an electron in the first orbit will be ___________

The reaction between aluminium and ferric oxide can generate temperatures up to 3273 K and is used in welding metals. (Atomic mass of AC = 27 u atomic mass of O = 16 u )
2Al + Fe₂O₃ \(\longrightarrow \) Al₂O₃ + 2Fe;  If in this process, 324 g of aluminum is allowed to react with 1.12 kg of ferric oxide
i) Calculate the mass of Al₂O₃ formed
ii) How much of the excess reagent is left at the end of the reaction ?

Explain the steps involved in ion-electron method for balancing redox reaction.

What is the de Broglie wavelength (in cm) of a 160 g cricket ball travelling at 140 Km hr ^-1.

What is the de Broglie wave length of an electron, which is accelerated from the rest, through a potential difference of 100 V ?

What are the factors influencing ionization enthalpy.

Calculate the amount of water produced by the combustion of 32 g of methane.

Show that the circumference of the Bohr orbit for the hydrogen atom is an integral multiple of the de Broglie wave length associated with the electron revolving arround the nucleus.

What is water-gas shift reaction?

How do you expect the metallic hydrides to be useful for hydrogen storage?

Write a note about ortho water and para water.

What do you understand by the term mole ?

Define equivalent mass.

Balance the following equations by oxidation number method - \({ K }Mno_{ 4 }+{ Na }_{ 2 }{ So }_{ 3 }\longrightarrow { MnO }_{ 2 }+{ Na }_{ 2 }{ So }_{ 4 }+KOH\)

Calculate the equivalent mass of the following - Sodium Hydroxide

The oxidation number of fluorine in all its compounds is equal to ______________.

Which of the following does not represent the mathematical expression for the Heisenberg uncertainty principle?

Match the list-I and list-II using the correct code given below the list.

Non-stoichiometric hydrides are formed by _____________

Consider the following statements.
(i) Alkali metals exhibit high chemical reactivity due to their low ionization energy.
(ii) Lithium is a very soft metal and even it can be cut with a knife.
(iii) Francium is a radioactive element in group 1 elements
Which of the above statements is/are not correct?

The number of molecules in 16g of methane is _________

Splitting of spectral lines in an electric field is called _____________

d-block elements form _____ compounds.

Water gas is _____.

Consider the following statements
1. Alkali metals are soft.
2. Alkali metals show high reactivity
3. I.E of alkali metal decreases down the group 
Which of the following statement(s) given above is/ are correct?

Which one of the followings affects chlorophyll ?

Green house gases cause _____________

Pick the viable pollutant among the following.

Statement I : Photochemical smog is also known as oxidizing smog.
Statement II : Photochemical smog .is chiefly composed of O₃, PAN, etc

Which causes water pollution?

Which of the following is secondary alkyl halide?

Grignard reagent is prepared by between___________.

Among the following, which is not an allylic halide?

The order of stability of the carbonium ion is__________.

___________is used in fire extinguishers

C₆H₅CH₂CH₂CH₃ is when oxidised in the presence of alke kMnO_4, the product obtained is ____________

The number of axial hydrogen atoms in chair form of cyclohexane is ______________

Torsion strain is the repulsive interaction between ___________

In E1, reaction, the intermediate formed is ___________

How many structural isomers are possible for the molecular formula C₄H₈ which can undergo ozonolysis?

The most stable carbocation is ____________

The most stable carbanion is _____________

CH₂ is an _________

The electrometric effect is ___________

The stability of alkyl free radicals is due to ___________

The compound which has one isopropyl group is _________

The number of chain isomers possible in C₅ H_I2 is ____________

Number of structural isomers possible in C₃H₆O are ___________

Principle behind crystallization is __________

What is the method involved in purification of chloroform and aniline?

Find out the most favourable condition for electrovalent bonding.

The sharing of valence electrons between the atoms will lead to the formation of_____

Which compound has planar structure?

H₂O is polar, whereas BeF₂ is not It is because ___________

Which of the following is a polar molecule?

Vapour pressure is the pressure exerted by vapours ____________

A sample of toothpaste weighting 500g, on analysis was found to contain 0.2g of fluorine. The concentration of fluorine in ppm is ____________

For associative solutes ____________

For a non-electrolytic solution ____________

The normality of 10% weight/volume) acetic and is ____________

Solubility of carbon dioxide gas in cold water can be increased by ____________

Which one of the following is incorrect statement?

Hydrogen (a moles) and iodine (b moles) react to give 2x moles of the HI at equilibrium. The total number of moles at equilibrium is _____________

XY₂ dissociates as,\(XY_{ 2\left( g \right) }\rightleftharpoons { XY }_{ \left( g \right) }+Y_{ \left( g \right) }\) Initial pressure of XY₂ is 600mm Hg. The total pressure at equilibrium is 800mm Hg. Assuming volume of system to remain constant, the value of K_p is ______________

A state of equilibrium is reached when _____________

For an adiabatic process ____________

Which among the following is an intensive property?

For an isochoric process, ΔU = _______________

If the heat flows out of the system into the surrounding, the q value becomes _________

The extensive and intensive properties respectively are ____________

Pressure is _____________

The standard atmospheric pressure is the pressure that supports a column of mercury exactly ___________ high at 0° C at sea level.

The mathematical expression V\(\infty \) n relates to _____________

Pick the equation that gives you the relationship between molecular mass and density.

When the gas behaves ideally, the compression factor Z is ___________

The electronic configuration of the elements A and B are 1s², 2s ²,2p⁶,3s² and 1s², 2s²,2p⁵ respectively. The formula of the ionic compound that can be formed between these elements is ___________

The group of elements in which the differentiating electron enters the anti penultimate shell of atoms are called ___________

Period of an element is represented by _____ quantum number

The first list of 23 chemical elements was published by _____ in the year 1789.

In the third period the first ionization potential is of the order.

Water gas is _____.

If a body of a fish contains 1.2 g hydrogen in its total body mass, if all the hydrogen is replaced with deuterium then the increase in body weight of the fish will be ______________

The cause of permanent hardness of water is due to _____________

Deuterium consist of _____________

The radioactive isotope of hydrogen is __________

For alkali metals, which one of the following trends is incorrect ?

Which of the following compounds will not evolve H₂ gas on reaction with alkali metals ?

Lithium shows diagonal relationship with _____________

The radio active element of group 1 is ______

Half life of francium is _______