Thermodynamics MCQs

Question 1

C v is given by

Accepted Answer

$${\left( {\frac{{\partial {	ext{E}}}}{{\partial {	ext{T}}}}} ight)_{	ext{V}}}$$

Answer

$${\left( {\frac{{\partial {	ext{E}}}}{{\partial {	ext{V}}}}} ight)_{	ext{T}}}$$

Answer

$${\left( {\frac{{\partial {	ext{E}}}}{{\partial {	ext{P}}}}} ight)_{	ext{V}}}$$

Answer

$${\left( {\frac{{\partial {	ext{V}}}}{{\partial {	ext{T}}}}} ight)_{	ext{P}}}$$

Question 2

C v for an ideal gas

Accepted Answer

Is independent of both pressure and volume

Answer

Does not depend upon temperature

Answer

Is independent of pressure only

Answer

Is independent of volume only

Question 3

In the reaction, represented by, 2SO 2 + O 2 ⇋ 2SO 3 ; ΔH = -42 kcal; the forward reaction will be favoured by

Accepted Answer

Both A and B

Answer

Low temperature

Answer

High pressure

Answer

Neither A nor B

Question 4

In which of the following reaction equilibria, the value of equilibrium constant K p will be more than is K c ?

Accepted Answer

N 2 O 4 ⇋ 2NO 2

Answer

2H$$I$$ ⇋ H 2 + $${I_2}$$

Answer

2SO 2 + O 2 ⇋ 2SO 3

Answer

None of these

Question 5

Pick out the wrong statement pertaining to the decomposition of PCl 5 represented by, PCl 5 ⇋ PCl 3 + Cl 2 . Degree of dissociation of PCl 5 will

Accepted Answer

None of these

Answer

Decrease on addition of Cl 2

Answer

Increase on addition of an inert gas at constant pressure

Answer

Decrease on increasing the pressure of the system

Question 6

The compressibility factor of a gas is given by (where, V 1 = actual volume of the gas V 2 = gas volume predicted by ideal gas law)

Accepted Answer

$$\frac{{{{	ext{V}}_1}}}{{{{	ext{V}}_2}}}$$

Answer

$$\frac{{{{	ext{V}}_2}}}{{{{	ext{V}}_1}}}$$

Answer

V 1 - V 2

Answer

V 1 × V 2

Question 7

All gases during throttling process at atmospheric temperature and pressure show a cooling effect except

Accepted Answer

H 2

Answer

CO 2

Answer

O 2

Answer

N 2

Question 8

With increase in pressure (above atmospheric pressure), the C p of a gas

Accepted Answer

Increases

Answer

Decreases

Answer

Remains unchanged

Answer

First decreases and then increases

Question 9

Forward reaction will be favoured for the exothermic reaction, represented by CO + H 2 O ⇋ CO 2 + H 2 , by

Accepted Answer

Low temperature and high pressure

Answer

Low temperature and low pressure

Answer

High temperature and high pressure

Answer

High temperature and low pressure