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Free download in PDF Class 11 Chemistry Chapter 6 Thermodynamics Multiple Choice Questions and Answers for Board, JEE, NEET, AIIMS, JIPMER and other competitive exams. MCQ Questions for Class 11 Chemistry with Answers were prepared based on the latest exam pattern. These short solved questions or quizzes are provided by Gkseries./p>
(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
(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)
(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
(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
(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
(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
(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:
[A]
12P1V1
[B]
6P1V1
[C]
5P1V1
[D]
P1V1
(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
(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
(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
(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
(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
(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)
(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
(19)
One mole of which of the following has the highest entropy?
[A]
Liquid Nitrogen
[B]
Hydrogen Gas
[C]
Mercury
[D]
Diamond
(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
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