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Thermodynamics - 2 - JEE MCQ

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30 Questions MCQ Test - Thermodynamics - 2

Thermodynamics - 2 for JEE 2024 is part of JEE preparation. The Thermodynamics - 2 questions and answers have been prepared according to the JEE exam syllabus.The Thermodynamics - 2 MCQs are made for JEE 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Thermodynamics - 2 below.

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Thermodynamics - 2 - Question 1

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3 moles of a diatomic gas are heated from 127° C to 727° C at a constant pressure of 1 atm. Entropy change is (log 2.5 = 0 .4)

A.
-22.98 JK^-1
B.
22.98 JK^-1
C.
57.4 JK^-1
D.
80.42 JK^-1

Detailed Solution for Thermodynamics - 2 - Question 1

∆S = nCplnT₂/T₁ + nRlnP₁/P₂
Since pressure is constant, so the second term will be zero.
Or ∆S = 3×7/2×8.314×2.303×log(1000/400)
= 80.42 JK^-1

Thermodynamics - 2 - Question 2

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Exactly 100 J of heat was transferred reversibly to a block of gold at 25.00° C from a thermal reservoir at 25.01 °C, and then exactly 100 J of heat was absorbed reversibled from the block of gold by a thermal reservoir at 24.99° C. Thus entropy change of the system is

A.
0.335 JK^-1
B.
-0.33 JK^-1
C.
0.670 JK^-1
D.
0.00 JK^-1

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Thermodynamics - 2 - Question 3

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Consider a reversible isentropic expansion of 1.0 mole of an ideal monoatomic gas from 25°C to 75°C. If the initial pressure was 1.0 bar, final pressure is

A.
1.474 bar
B.
0.678 bar
C.
0.796 bar
D.
1.00 bar

Detailed Solution for Thermodynamics - 2 - Question 3

Isentropic process means that entropy is constant. This is true only for reversible adiabatic process.
Applying P₁^1-γ T₁^γ = P₂^1-γ T₂^γ (for monatomic species, γ = 5/3)
(1/P)-⅔ = (75+273/25+273)^5/3
Or (1/P)-2 = (348/298)⁵
Or P = 1.474 bar

Thermodynamics - 2 - Question 4

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For the process, and 1 atmosphere pressure, the correct choice is

[JEE Advanced 2014]

A.
ΔS_(System) > 0, ΔS_{(surrounding)}> 0
B.
ΔS_(System) > 0, ΔS_{(surrounding)}< 0
C.
ΔS_(System) < 0, ΔS_{(surrounding)}> 0
D.
ΔS_(System) < 0, ΔS_{(surrounding)} < 0

Detailed Solution for Thermodynamics - 2 - Question 4

At 100°C and 1 atmosphere pressure H₂O (l) ⇋ H₂O(g) is at equilibrium. For equilibrium

*Multiple options can be correct

Thermodynamics - 2 - Question 5

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Benzene and naphthalene form an ideal solution at room temperature. For this process, the true statement(s) is (are)

[JEE Advanced 2013]

A.
ΔG is positive
B.
ΔS_(system) is positive
C.
ΔS_{(Surrounding)} is zero
D.
ΔH = 0

Detailed Solution for Thermodynamics - 2 - Question 5

When an ideal solution is formed process is spontaneous

According to Raoult's law, for an ideal solution

ΔH=0

ΔVmix=0

Since there is no exchange of heat energy between system and surroundings

ΔSsurroundings=0

ΔSsys.=+ve

∴ From the relation

ΔG=ΔH–TΔS

ΔG=−ve

Hence, the correct options are B, C and D

Thermodynamics - 2 - Question 6

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Detailed Solution for Thermodynamics - 2 - Question 6

Thermodynamics - 2 - Question 7

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Detailed Solution for Thermodynamics - 2 - Question 7

Thermodynamics - 2 - Question 8

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Detailed Solution for Thermodynamics - 2 - Question 8

Thermodynamics - 2 - Question 9

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Detailed Solution for Thermodynamics - 2 - Question 9

Thermodynamics - 2 - Question 10

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A.
(2x + y)
B.
(x – y)
C.
(x + y)
D.
(2x – y)

Detailed Solution for Thermodynamics - 2 - Question 10

Thermodynamics - 2 - Question 11

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A.
ΔS_system > 0 and ΔS_surroundings > 0
B.
ΔS_system > 0 and ΔS_surroundings < 0
C.
ΔS_system < 0 and ΔS_surroundings > 0
D.
ΔS_system < 0 and ΔS_surroundings < 0

Detailed Solution for Thermodynamics - 2 - Question 11

Thermodynamics - 2 - Question 12

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A.
+10.3 kJ
B.
-43.3 kJ
C.
-10.3 kJ
D.
+6.2 kJ

Detailed Solution for Thermodynamics - 2 - Question 12

Thermodynamics - 2 - Question 13

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Detailed Solution for Thermodynamics - 2 - Question 13

Thermodynamics - 2 - Question 14

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Detailed Solution for Thermodynamics - 2 - Question 14

Thermodynamics - 2 - Question 15

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Detailed Solution for Thermodynamics - 2 - Question 15

Thermodynamics - 2 - Question 16

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A.
-261 kJ
B.
+103 kJ
C.
+261 kJ
D.
-103 kJ

Detailed Solution for Thermodynamics - 2 - Question 16

Thermodynamics - 2 - Question 17

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Detailed Solution for Thermodynamics - 2 - Question 17

Thermodynamics - 2 - Question 18

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Detailed Solution for Thermodynamics - 2 - Question 18

Thermodynamics - 2 - Question 19

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A.
C is the thermodynamically stable product.
B.
Formation of A and B from C has highest enthalpy of activation.
C.
Activation enthalpy to form C is 5 kJ mol^–1 less than that to form D
D.
D is kinetically stable product.

Detailed Solution for Thermodynamics - 2 - Question 19

Thermodynamics - 2 - Question 20

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A.
(A), (B) and (C)
B.
(A) and (B)
C.
(A) and (D)
D.
(B), (C) and (D)

Detailed Solution for Thermodynamics - 2 - Question 20

Thermodynamics - 2 - Question 21

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A. 9
B. ERROR
C. ERROR
D. ERROR

Detailed Solution for Thermodynamics - 2 - Question 21

Thermodynamics - 2 - Question 22

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A.
+141.2 kJ/mol
B.
+1412 kJ/mol
C.
–141.2 kJ/mol
D.
–1412 kJ/mol

Detailed Solution for Thermodynamics - 2 - Question 22

Thermodynamics - 2 - Question 23

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Which one of the following equations does not correctly represent the first law of thermodynamics for the given processes involving an ideal gas ? (Assume non-expansion work is zero)

A.
Adiabatic process : ΔU = –w
B.
Cyclic process : q = – w
C.
Isothermal process : q = – w
D.
Isochoric process : ΔU = q

Detailed Solution for Thermodynamics - 2 - Question 23

Thermodynamics - 2 - Question 24

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A.
5
B.
10
C.
95
D.
100

Detailed Solution for Thermodynamics - 2 - Question 24

Thermodynamics - 2 - Question 25

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A.
1250 K
B.
500 K
C.
750 K
D.
1000 K

Detailed Solution for Thermodynamics - 2 - Question 25

Thermodynamics - 2 - Question 26

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A.
2.85
B.
22.8
C.
11.4
D.
5.7

Detailed Solution for Thermodynamics - 2 - Question 26

Thermodynamics - 2 - Question 27

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A.
–6 J
B.
–608 J
C.
+304 J
D.
–304 J

Detailed Solution for Thermodynamics - 2 - Question 27

Thermodynamics - 2 - Question 28

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Detailed Solution for Thermodynamics - 2 - Question 28

Thermodynamics - 2 - Question 29

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Detailed Solution for Thermodynamics - 2 - Question 29

Thermodynamics - 2 - Question 30

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Detailed Solution for Thermodynamics - 2 - Question 30

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