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BITSAT SERIES
Chemistry

Work Done In Thermodynamics

17 previous year questions.

Volume: 17 Ques
Yield: Medium

High-Yield Trend

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2026
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2025
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2011

Chapter Questions
17 MCQs

01
PYQ 2011
medium
chemistry ID: bitsat-2
What is the free energy change, Δ G, when 1.0 mole of water at 100C and 1 atm pressure is converted into steam at 100C and 1 atm pressure?
1
540 cal
2
–9800 cal
3
9800 cal
4
0 cal
02
PYQ 2013
medium
chemistry ID: bitsat-2
The enthalpy of combustion of 2 moles of benzene at 27°C differs from the value determined in bomb calorimeter by
1

2

3

4

03
PYQ 2014
medium
chemistry ID: bitsat-2
If the enthalpy of vaporization of water is , the entropy of its vaporization will be:
1

2

3

4
04
PYQ 2015
medium
chemistry ID: bitsat-2
Which law of thermodynamics helps in calculating the absolute entropies of various substances at different temperatures?
1
First law
2
Second law
3
Third law
4
Zeroth law
05
PYQ 2015
medium
chemistry ID: bitsat-2
A spontaneous reaction is impossible if:
1
both and are negative
2
both and are positive
3
is negative and is positive
4
is positive and is negative
06
PYQ 2016
medium
chemistry ID: bitsat-2

Figure below shows two paths that may be taken by a gas to go from a state A to a state C. In process AB, 400J of heat is added to the system and in process BC, 100J of heat is added to the system. The heat absorbed by the system in the process AC will be: 

1

2

3

4
380J
07
PYQ 2016
medium
chemistry ID: bitsat-2
For a particular reversible reaction at temperature T, Δ H and Δ S were found to be both positive. If Tₑ is the temperature at equilibrium, the reaction would be spontaneous when:
1

2

3
is 5 times
4
T = Tₑ
08
PYQ 2017
medium
chemistry ID: bitsat-2
For the reaction CO(g) + (1)/(2)O₂(g) → CO₂(g), which one of the statements is correct at constant T and P?
1

2

3

4
Δ H is independent of physical state of the reactants
09
PYQ 2017
medium
chemistry ID: bitsat-2
For a given reaction, Δ H = 35.5 kJ mol^-1 and Δ S = 83.6 J K⁻1 mol⁻1. The reaction is spontaneous at
1

2
all temperatures
3

4
T<425K
10
PYQ 2018
medium
chemistry ID: bitsat-2
For vaporization of water at 1 atmospheric pressure, the values of Δ H and Δ S are 40.63kJ mol⁻1 and 108.8J K⁻1mol⁻1, respectively. The temperature when Gibbs free energy change (Δ G) for this transformation will be zero, is:
1

2

3

4
373.4K
11
PYQ 2019
medium
chemistry ID: bitsat-2
A spontaneous reaction is impossible if
1
both Δ H and Δ S are negative
2
both Δ H and Δ S are positive
3
Δ H is negative and Δ S is positive
4
Δ H is positive and Δ S is negative
12
PYQ 2019
medium
chemistry ID: bitsat-2
Which law of thermodynamics helps in calculating the absolute entropies of various substances at different temperatures?
1
First law
2
Second law
3
Third law
4
Zeroth law
13
PYQ 2020
medium
chemistry ID: bitsat-2
For a particular reversible reaction at temperature T, Δ H and Δ S were found to be both positive. If Tₑ is the temperature at equilibrium, then the reaction would be spontaneous when:
1

2

3

4
T = Tₑ
14
PYQ 2021
medium
chemistry ID: bitsat-2
For the reaction CO(g) + (1)/(2)textO₂(textg) → textCO₂(textg), which one of the statements is correct at constant T and P?
1
Δ H = Δ E
2
Δ H < Δ E
3
Δ H > Δ E
4
Δ H is independent of physical state of the reactants
15
PYQ 2021
medium
chemistry ID: bitsat-2
For a given reaction, Δ H = 35.5kJ mol⁻1 and Δ S = 83.6J K⁻1mol⁻1. The reaction is spontaneous at (Assume that Δ H and Δ S do not vary with temperature)
1
T > 425K
2
All temperatures
3
T > 298K
4
T < 425K
16
PYQ 2025
easy
chemistry ID: bitsat-2
The work done by a gas during an isothermal expansion from 2 L to 4 L at a constant temperature, with pressure initially at 2 atm, is: (Use R = 8.314 J/mol·K, T = 300 K).
1

281 J

2
831.4 J
3
1247.1 J
4
1662.8 J
17
PYQ 2026
medium
chemistry ID: bitsat-2
For the reaction CO(g) + O (g) CO (g) Which one of the statement is correct at constant T and P?
1

2

3

4
is independent of physical state of the reactants

About Work Done In Thermodynamics - BITSAT

Work Done In Thermodynamics is a vital chapter for BITSAT aspirants. Mastering the concepts covered in this chapter is essential for securing a top rank.

By rigorously practicing the previous year questions associated with this chapter, you can identify high-yield topics, understand the examiner's perspective, and boost your confidence during the actual exam.

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