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Multiple Choice Questions and Answers on Class 11 Chemistry Chapter 6 Thermodynamics

Questions
1 Standard enthalpy of vapourisation ΔHvap for water at 100oC is 40.66 kJmol-1. The internal energy of vapourisation of water at 100°C (in kJmol-1) is (Assume water vapour to behave like an ideal gas)
A 43.76
B 40.66
C 37.56
D -43.76

Answer:37.56
2 Which of the following salts will have maximum cooling effect when 0.5 mole of the salt is dissolved in same amount of water. Integral heat of solution at 298 K is given for each salt?
A KNO3 (∆H = 35.4 kJ mol-1)
B NaCl (∆H = 5.35 kJ mol-1)
C HBr (∆H = -83.3 kJ mol-1)
D KOH ( ∆H = -55.6 kJ mol-1)

Answer:KNO3 (∆H = 35.4 kJ mol-1)
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3 The temperature of the system decreases in an ______.
A Adiabatic Compression
B Isothermal Expansion
C Isothermal Compression
D Adiabatic Expansion

Answer:Adiabatic Expansion
4 A system absorb 10 kJ of heat at constant volume and its temperature rises from 270°C to 370°C. The value of ∆ U is
A 100 kJ
B 10 kJ
C 0 kJ
D 1 kJ

Answer:10 kJ
5 Based on the first law of thermodynamics, which one of the following is correct?
A For an isothermal process, q = +w
B For an isochoric process, ΔU = -q
C For an adiabatic process, ΔU = -w
D For a cyclic process, q = -w

Answer:For a cyclic process, q = -w
6 The amount of the heat released when 20 ml 0.5 M NaOH is mixed with 100 ml 0.1 M HCl is x kJ. The heat of neutralization is
A -100 × kJ/mol
B -50 × kJ/mol
C 100 × KJ/mol
D 50 × kJ/mol

Answer:-100 × kJ/mol
7 The enthalpies of combustion of carbon and carbon monoxide are -393.5 and -283.0 kJ mol-1 respectively. The enthalpy of formation of carbon monoxide is:
A -676 kJ
B 110.5 kJ
C -110.5 kJ
D 676.5 kJ

Answer:-110.5 kJ
8 Which thermodynamic function accounts automatically for enthalpy and entropy both?
A Helmholtz Free Energy (A)
B Internal Energy (E)
C Work Function
D Gibbs Free Energy

Answer:Gibbs Free Energy
9 The bond energy (in kcal mol-1) of a C-C single bond is approximately
A 1
B 10
C 83-85
D 1000

Answer:83-85
10 In which of the following process, a maximum increase in entropy is observed?
A Dissolution of Salt in Water
B Condensation of Water
C Sublimation of Naphthalene
D Melting of Ice

Answer:Sublimation of Naphthalene
11 An ideal gas is taken around the cycle ABCA as shown in P-V diagram The next work done by the gas during the cycle is equal to:

thermodynamics

A 12P1V1
B 6P1V1
C 5P1V1
D P1V1

Answer:5P1V1
12 A system absorb 10 kJ of heat at constant volume and its temperature rises from 270 C to 370 C. The value of ∆ U is
A 100 kJ
B 10 kJ
C 0 kJ
D 1 kJ

Answer:10 kJ
13 In a system where ∆E = -51.0 kJ, a piston expanded against a pext of 1.2 atm giving a change in volume of 32.0 L. What was the change in heat of this system?
A -36 kJ
B -13 kJ
C -47 kJ
D 24 kJ

Answer:-47 kJ
14 Calculate the heat required to make 6.4 Kg CaC2 from CaO(s) and C(s) from the reaction: CaO(s) + 3 C(s) → CaC2(s) + CO (g) given that ∆f Ho (CaC2) = -14.2 kcal. ∆f H° (CO) = -26.4 kcal.
A 5624 kcal
B 1.11 × 104 kcal
C 86.24 × 10³
D 1100 kcal

Answer:1.11 × 104 kcal
15 Which of the following is true for the reaction? H2O (l) ↔ H2O (g) at 100° C and 1 atm pressure
A ∆S = 0
B ∆H = T ∆S
C ∆H = ∆U
D ∆H = 0

Answer:∆S = 0
16 In a reversible process the system absorbs 600 kJ heat and performs 250 kJ work on the surroundings. What is the increase in the internal energy of the system?
A 850 kJ
B 600 kJ
C 350 kJ
D 250 kJ

Answer:350 kJ
17 The species which by definition has ZERO standard molar enthalpy of formation at 298 K is
A Br2(g)
B Cl2(g)
C H2O(g)
D CH4(g)

Answer:Cl2(g)
18 The enthalpy of vaporisation of a substance is 8400 J mol-1 and its boiling point is –173°C. The entropy change for vaporisation is :
A 84 J mol-1K-1
B 21 J mol-1K-1
C 49 J mol-1K-1
D 12 J mol-1K-1

Answer: 84 J mol-1K-1
19 One mole of which of the following has the highest entropy?
A Liquid Nitrogen
B Hydrogen Gas
C Mercury
D Diamond

Answer:Hydrogen Gas
20 Third law of thermodynamics provides a method to evaluate which property?
A Absolute Energy
B Absolute Enthalpy
C Absolute Entropy
D Absolute Free Energy

Answer:Absolute Entropy

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