# Thermodynamics and Thermochemistry MCQ with Answers for IIT JAM 2023

## Thermodynamics and Thermochemistry MCQ with Answers for IIT JAM 2023

1. According to the cyclic rule, (∂P/∂V)T (∂V/∂T)P (∂T/∂P)V is equal to

(a) 0
(b) positive
(c) negative
(d) infinity

2. The value of 3000 Joule is equal to

(a) > 30 Litre-atm
(b) < 30 Litre-atm
(c) = 30 Litre-atm
(d) None of these

3. The value of 1 Joule = Mn litre-bar in n = -1 then the value of M is

(a) 10
(b) 100
(c) 10-2
(d) 104

4. The correct thermodynamic relations among the following is

(a) (∂U/∂V)S = -P
(b) (∂H/∂V)S = -P
(c) (∂G/∂V)S = -P
(d) (∂A/∂V)S = -S

5. Which of the following is not an exact differential?

(a) dQ (Q = heat absorbed)
(b) dU (U = internal energy)
(c) dS (S = entropy)
(d) dG (G = free energy)

6. According to one of the Maxwell reactions, (∂V/∂P)T = (∂P/∂T)V. Hence for 1 mole of an ideal gas, (∂V/∂P)T is equal to

(a) P/T
(b) T/P
(c) PT
(d) P/V

7. From Maxewall thermodynamics relation. The value of p may be obtained in terms of first partial derivatives of thermodynamic potential

(a) G, U
(b) G, A
(c) A, U
(d) H, U

8. The value of (∂G/∂T)p is equal to

(a) (∂A/∂T)V
(b) (∂A/∂V)T
(c) (∂U/∂T)V
(d) (∂A/∂T)p

9. The value of (∂S/∂P)T is equal to

(a) (∂V/∂T)p
(b) – (∂V/∂P)T
(c) – (∂V/∂T)p
(d) (∂V/∂P)T

10. The thermodynamic potential which must be negative for spontaneous process at constant temperature and at constant pressure

(a) G
(b) H
(c) A
(d) U

I1. Aprocess is carried out at constant volume and at constant entropy. It will be spontaneous if:

(a) ΔG < 0
(b) ΔU < 0
(c) ΔA < 0
(d) ΔH < 0

12. Which of the following is not an endothermic reaction?

(a) Combustion of methane
(c) Dehydrogenation ofethane to ethylene
(b) Decomposition of water
(d) Conversion of graphite to diamond

13. ΔfH° is non zero for

(a) Br2 (l)
(b) O2 (g)
(c) C graphite
(d) NO (g)

14. Heat of formation of a compound is equal to magnitude to its

(a) heat of reaction
(b) heat of decomposition
(c) heat of combustion
(d) heat of solution

15. If total enthalpies of reactants and products are HR & HP respectively, then for an endothermic reaction.

(a) HR < HP
(b) HR = HP
(c) HR > HP
(d) HR ≥ HP