Chemistry 12 Chapter 2 Exemplar Solutions Question and Answer Part 4

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II. Multiple Choice Questions (Type-II

Note: In the following questions two or more options may be correct.

Question 27:

Which of the following factor (s) affect the solubility of a gaseous solute in the fixed volume of liquid solvent?

(a) Nature of solute

(b) Temperature

(c) Pressure

(i) (a) and (c) at constant T

(ii) (a) and (b) at constant P

(iii) (b) and (c) only

(iv) (c) only

Answer: (i), (ii)

Question 28:

Intermolecular forces between two benzene molecules are nearly of same strength as those between two toluene molecules. For a mixture of benzene and toluene, which of the following are not true?

(i)

(ii)

(iii) These will form minimum boiling azeotrope.

(iv) These will not form ideal solution.

Answer: (iii), (iv)

Question 29:

Relative lowering of vapour pressure is a colligative property because _____________.

(i) It depends on the concentration of a non-electrolyte solute in solution and does not depend on the nature of the solute molecules.

(ii) It depends on number of particles of electrolyte solute in solution and does not depend on the nature of the solute particles.

(iii) It depends on the concentration of a non-electrolyte solute in solution as well as on the nature of the solute molecules.

(iv) It depends on the concentration of an electrolyte or nonelectrolyte solute in solution as well as on the nature of solute molecules.

Answer: (i), (ii)

Question 30:

Van’t Hoff factor i is given by the expression _____________.

(i)

(ii)

(iii)

(iv)

Answer: (i), (iii)

Question 31:

Isotonic solutions must have the same _____________.

(i) Solute

(ii) Density

(iii) Elevation in boiling point

(iv) Depression in freezing point

Answer: (ii), (iii)

Question 32:

Which of the following binary mixtures will have same composition in liquid and vapour phase?

(i) Benzene - Toluene

(ii) Water-Nitric acid

(iii) Water-Ethanol

(iv) n-Hexane - n-Heptane

Answer: (ii), (iii)

Question 33:

In isotonic solutions ________________.

(i) Solute and solvent both are same.

(ii) Osmotic pressure is same.

(iii) Solute and solvent may or may not be same.

(iv) Solute is always same solvent may be different.

Answer: (ii), (iii)

Question 34:

For a binary ideal liquid solution, the variation in total vapour pressure versus composition of solution is given by which of the curves?

(i)

Liquid solution

Liquid Solution

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(ii)

Liquid solution

Liquid Solution

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(iii)

Liquid solution

Liquid Solution

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(iv)

Liquid solution

Liquid Solution

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Answer: (i), (iv)

Question 35:

Colligative properties are observed when _____________.

(i) A non-volatile solid is dissolved in a volatile liquid.

(ii) A non-volatile liquid is dissolved in another volatile liquid.

(iii) A gas is dissolved in non-volatile liquid.

(iv) A volatile liquid is dissolved in another volatile liquid.

Answer: (i), (ii)