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.

Complete the following chemical reactions and classify them into
(a) hydrolysis (b) redox (c) hydration reactions.
(1) KMnO₄ + H₂O₂ ➝
(2) CrCl₃ + H₂O ➝
(3) CaO + H₂O ➝

Arrange NH₃, H₂O and HF in the order of increasing magnitude of hydrogen bonding and explain the basis for your arrangement.

Write balanced chemical equation for each of the following chemical reactions.
Rubidum with oxgen gas

A sample of gas has a volume of 8.5 dm³ at an unknown temperature. When the sample is submerged in ice water at 0 °C, its volume gets reduced to 6.37 dm³. What is its initial temperature ?

An unknown gas diffuses at a rate of 0.5 time that of nitrogen at the same temperature and pressure. Calculate the molar mass of the unknown gas.

The standard enthalpies of formation of SO₂ and SO₃ are -297 kJ mol^-1 and -396 kJ mol^-1 respectively. Calculate the standard enthalpy of reaction for the reaction: SO₂ + \(\frac{1}{2}\)O₂⟶SO₃

For a chemical reaction the values of ΔH and ΔS at 300K are -10 KJ mole^-1 and -20 J deg^-1 mole^-1 respectively. What is the value of ΔG of the reaction? Calculate the ΔG of a reaction at 600K assuming ΔH and ΔS values are constant. Predict the nature of the reaction.

Give the IUPAC names of the following compounds.
​\({ CH }_{ 2 }-{ CH }_{ 2 }-\underset { \overset { | }{ OH } }{ CH } -CHO\)​

Give the IUPAC names of the following compounds.

Give the IUPAC names of the following compounds.

Give the structure for the following compound.
1,3,5- Trimethyl cyclohex - 1 -ene

Give the structure for the following compound.
1, 3- Dimethylcyclohexane

What are electrophiles and nucleophiles ? Give suitable examples for each.

Give examples for the following types of organic reactions.
Electrophilic substitution.

Describe the mechanism of Nitration of benzene.

write all possible isomers for an aromatic benzenoid compound having the molecular formula C₈H₁₀

How will you prepare n propyl iodide from n-propyl bromide?

A hydrocarbon C₃H₆ (A) reacts with HBr to form compound (B). Compound (B) reacts with aqueous potassium hydroxide to give (C) of molecular formula C₃H₆O.what are (A) (B) and (C). Explain the reactions.

What would happen, if the greenhouse gases were totally missing in the earth’s atmosphere ?

How would you know whether a redox reaction is taking place in an acidic, alkaline or neutral medium?

How much volume of hydrogen is liberated when 0.12g of magnesium reacts with dilute hydrochloric acid ?

Write the name and deduce the atomic number of the following element
i. The second alkali metal
ii. The fourth noble gas
iii. The third halogen
iv. The first transition element

Define the following terms.

Define the Molar Heat of Sublimation

What is the nature of the reaction for the following?
(i) ΔG>0
(ii) ΔG<0
(iii) ΔG=0