22 g of CO₂ contains ____________ molecules of CO₂.

For d-electron, the orbital angular momentum is ___________

Ionic radii vary in:
(1) inverse proportion to the effective nuclear charge
(2) inverse proportion to the square of the effective nuclear charge.
(3) direct proportion to the screening effect.
(4) direct proportion to the square of screening effect

Tritium nucleus contains _____________

sodium is stored in _____________

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

The correct thermodynamic conditions for the spontaneous reaction at all temperature is ______________

For the reaction \(A+3B\rightleftharpoons 2C+D\) initial mole of A is twice that of B.1f at equilibrium moles of B and C are equal, then percent of B reacted is ____________

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

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

In an organic compound, phosphorus is estimated as ____________

Which of the group has highest +I effect ?

In the commercial gasonlines, the type of hydrocarbons which are more desirable is ___________

________________is used in the treatment of goitre

Assertion (A) : Oxygen plays a key role in the troposphere
Reason (R) : Troposphere is not responsible for all biological activities
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

3 grams of hydrogen reacts with 29g of O, to yield H₂O. Calculate the amount of one of the reactants which remains unreacted.

How many radial nodes for 2s, 4p, 5d and 4f orbitals exhibit? How many angular nodes

Would you expect the first ionization enthalpies of two isotopes of the same element to be the same or different? Justify your answer.

Identify the elements that are in gaseous state under normal atmospheric conditions.

For a gaseous homogeneous reaction at equilibrium, number of moles of products are greater than the number of moles of reactants. Is K_C is larger or smaller than K_P.

Does H₂O and H₂S possess same bond, angle ? Explain

Write the molecular formula of the first six members of homologous series of nitro alkanes.

Write short notes on
(i) +E effect and
(ii) -E effect

Mention any three methods of preparation of haloalkanes from alcohols.

What is the difference between molecular mass and molar mass ? Calculate the molecular mass and molar mass for carbon monoxide.

What are the reasons behind the Moseley's attempt in finding atomic number?

Do you think that heavy water can be used for drinking purposes?

When the driver of an automobile applies brake, the passengers are pushed toward the front of the car but a helium balloon is pushed toward back of the car. Upon forward acceleration the passengers are pushed toward the front of the car. Why?

Show that \(\Delta\)U = nC_v (T₂ - T₁) and \(\Delta\)H = nC_p(T₂ - T₁).

An aqueous solution of 2% nonvolatile solute exerts a pressure of 1.004 bar at the boiling point of the solvent. What is the molar mass of the solute when P_A is 1.013 bar ?

What is the difference between distillation, distillation under reduced pressure and steam distillation?

Explain the molecular orbirtal structure of benzene.

Even though the use of pesticides increases the crop production, they adversely affect the living organisms. Explain the function and the adverse effects of the pesticides.

Balance the following equation by oxidation number method:
P + HNO₃ \(\rightarrow\)H₃PO₄ + NO₂ + H₂O

Why the first ionisation enthalpy of sodium is lower than that of magnesium while its second ionisation enthalpy is higher than that of magnesium.

An element (A) belonging to group number 1 and period number 3 react with dihydrogen to form anhydride (B). The element (A) reacts with the universal solvent to give a strong base (C). Identify A, B, and C.

Describe briefly the biological Importance of Calcium and magnesium.

Find the pressure of 5 mole CI₂ gas filled in a 2 litre vessel at 27 °C temperature.

List the characteristics of Gibbs free energy

The equilibrium constant at 298 K for a reaction is 100.
A + B \(\rightleftharpoons \) C + D
If the initial concentration of all the four species is 1 M, the equilibrium concentration of D (in mol lit^-1) will be

Describe tautomerism with relevant examples.

Give a detailed account on the different mechanisms followed in elimination reaction.

How does classical smog differ from photochemical smog ?