Solutions

Question 1

In the light of the above statements, choose the most appropriate answer from the options given below. Assertion A: For an ideal solution formed by mixing liquids P and Q, ΔmixH = 0 and ΔmixV = 0. Reason R: No interactions occur between P and Q.

Accepted Answer

A is correct but R is not correct. The assertion is right: an ideal solution mixes with no enthalpy or volume change. The reason is wrong — interactions certainly do occur. The point is that the P–Q interaction is of the SAME strength as the P–P and Q–Q interactions it replaces, so the energies cancel; that is quite different from there being no interaction at all.

Answer

Both A and R are correct and R is the correct explanation of A

Answer

Both A and R are correct but R is NOT the correct explanation of A

Answer

A is not correct but R is correct

Question 2

Consider the following statements about the solutions formed by mixing two liquids. A. An ideal solution thus formed obeys Raoult's law throughout the composition range. B. Mixture of chloroform and acetone shows negative deviation from Raoult's law. C. Mixture of aniline and phenol shows positive deviation from Raoult's law.

Accepted Answer

A and B only. A is the definition of an ideal solution. B is right: chloroform and acetone form a new hydrogen bond between unlike molecules, so escaping tendency falls and the deviation is negative. C is wrong for the same reason — the hydrogen bond between phenol's proton and aniline's nitrogen is stronger than the like-with-like bonding it replaces, so that mixture also deviates negatively.

Answer

B and C only

Answer

A only

Answer

A and C only

Question 3

Match List-I with List-II and choose the correct answer from the options given below. List-I (Example): A. Humidity B. Alloys C. Amalgams D. Smoke List-II (Type of solution): I. Solid in solid II. Liquid in gas III. Solid in gas IV. Liquid in solid

Accepted Answer

A-II, B-I, C-IV, D-III. A solution is named solute-in-solvent. Humidity is water vapour dispersed in air, so liquid in gas. An alloy such as brass is one solid dissolved in another, so solid in solid. An amalgam is mercury, a liquid, dissolved in a solid metal, so liquid in solid. Smoke is fine solid particles suspended in a gas, so solid in gas. That gives A-II, B-I, C-IV, D-III.

Answer

A-II, B-IV, C-I, D-III

Answer

A-III, B-I, C-IV, D-II

Answer

A-III, B-II, C-I, D-IV

Q1.In the light of the above statements, choose the most appropriate answer from the options given below.

Q2.Consider the following statements about the solutions formed by mixing two liquids.

Q3.Match List-I with List-II and choose the correct answer from the options given below.