300+ TOP MCQs on Thermodynamics and Answers

NEET  Chemistry is the very imporatant paper in the Medical Entrance EXAM. So these NEET Chemistry MCQs with Answers for all Concepts as per the new syllabus. Practice daily with these NEET Chemistry objective questions on air pollution. NEET Chemistry Thermodynamics Multiple Choice Questions

MCQs on Thermodynamics :

1. What will be the value of ΔH, if the forward and reverse reactions have the same energy of activation?
(A) ΔH = ΔG = ΔS = 0
(B) ΔS = 0
(C) ΔG = 0
(D) ΔH = 0

Answer

Answer: (d)

2. What will be the entropy change (ΔS), when an ideal gas undergoes a change in the pressure from p_i to p_f isothermally?

Answer

Answer: (a)

3. Find out the relationship between x, y and z considering below three reactions

(A) y = 2z – x
(B) x = y – z
(C) x = y + z
(D) z = x + y

Answer

Answer: (c)

4. What is the molar entropy change for melting of ice at 0℃, if ΔH_f = 1.435 kcal/mol?
(A) 0.526 cal/(mol K)
(B) 5.26 cal/(mol K)
(C) 10.52 cal/(mol K)
(D) 21.04 cal/(mol K)

Answer

Answer: (b)

5. What is the function of a catalyst in a chemical reaction?
(A) decrease rate constant of reaction
(B) increases activation energy of reaction
(C) reduces enthalpy of reaction
(D) does not affect the equilibrium constant of reaction

Answer

Answer: (d)

6. What will be the work done by 3 moles of an ideal gas when it expands spontaneously in a vacuum?
(A) zero
(B) infinite
(C) 3 joules
(D) 9 joules

Answer

Answer: (a)

7. Find the temperature at which the below reaction will be in equilibrium if the enthalpy and entropy change for the reaction is 30 kJ mol^-1 and 105 J K^-1 mol^-1 respectively

Br_2(l) + Cl_2(g) → 2BrCl_(g)
(A) 273 K
(B) 300 K
(C) 450 K
(D) 285.7 K

Answer

Answer: (d)

8. Which is true for the entropy of a spontaneous reaction?
(A) ΔS_(system) – ΔS_{(surroundings)} > 0
(B) ΔS_(system) + ΔS_{(surroundings)} > 0
(C) ΔS_{(surroundings)} > 0 only
(D) ΔS_(system) > 0 only

Answer

Answer: (b)

9. An ideal gas is expanded isothermally at 300 K from 1 litre to 10 litres. Find the ΔE for this process (R = 2 cal mol^-1 K^-1)
(A) 9 L atm
(B) 1381.1 cal
(C) zero
(D) 163.7 cal

Answer

Answer: (c)

10. ΔH for the reaction N₂ + 3H₂ ⇋ 2NH₃
(A) ΔE – 2RT
(B) ΔE + 2RT
(C) ΔE – RT
(D) ΔH = RT

Answer

Answer: (a)