set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

Identify the incorrect statements regarding entropy.

1. At absolute zero temperature, entropy of a perfectly crystalline substance is taken to be zero.
2. At absolute zero temperature, the entropy of a perfectly crystalline substance is positive.
3. Absolute entropy of a substance cannot be determined.
4. At 0°C, the entropy of a perfectly crystalline substance is taken to be zero

a) 1, 2 and 4

b) 1, 2 and 3

c) 1, 3 and 4

d) 2, 3 and 4

Question : 2

Which one of the following when dissolved in H₂ O gives hissing sound?

a) Slaked lime

b) Sodalime

c) Limestone

d) Quicklime

Question : 3

Consider the following statements regarding Bohr atomic model:

1. It introduces the idea of stationary orbits.
2. It assumes that the angular momentum of the electron is equal to -$(1/2)h/{2π}$
3. It uses the planetary model of the atom involving circular orbits.

a) 1 and 3

b) 1 and 2

c) 2 and 3

d) 1, 2 and 3

Question : 4

The technique of chromatography is used to

a) Determine the structure of substances

b) Dry distillation of colouring substances

c) Identify colour substances

d) Separate the substances from a mixture

Question : 5

Which one of the following properties changes with valency?

a) Equivalent weight

b) Molecular weight

c) Atomic weight

d) Density

Question : 6

Give thought to following statements.

1. In the process of osmosis, the solvent moves towards a dilute solution from the concentrated solution.
2. In reverse osmosis internal pressure but upon a dilute solution.

a) Only 2

b) Both 1 and 2

c) Only 1

d) Neither 1 nor 2