MHT-CET SERIES Chemistry
Thermodynamics
55 previous year questions.
Volume: 55 Ques
Yield: High
High-Yield Trend
8
2025 3
2024 1
2023 3
2022 38
2020 1
2019 1
2018 Chapter Questions 55 MCQs
01
PYQ 2018
easy
chemistry ID: mht-cet-
Which among the following equations represents the first law of thermodynamics under isobaric conditions ?
1
2
3
4
02
PYQ 2019
medium
chemistry ID: mht-cet-
Identify the equation in which change in enthalpy is equal to change in internal energy
1
2
3
4
03
PYQ 2020
medium
chemistry ID: mht-cet-
Which of the following conditions indicates the reaction is spontaneous?
1
at all temperature
2
at low temperature
3
at all temperature
4
at high temperature
04
PYQ 2020
medium
chemistry ID: mht-cet-
The reaction is an example of .......
1
Swarts reaction
2
Finkelstein reaction
3
Wurtz – fittig reaction
4
Sandmeyer’s reaction
05
PYQ 2020
medium
chemistry ID: mht-cet-
Which of the following compounds is NOT present in its standard state at 25 C and 1 atmosphere pressure?
1
2
3
4
06
PYQ 2020
medium
chemistry ID: mht-cet-
For the combustion of 1 mole of liquid benzene at 298K, the heat of reaction at constant pressure is -3268 kJ mol , what is the heat of combustion at constant volume?
1
- 3264.2 kJ mol
2
- 1632 kJ mol
3
- 6728 kJ mol
4
- 672.8 kJ mol
07
PYQ 2020
medium
chemistry ID: mht-cet-
For the following reaction:
Given that \text{and} , what is the value of at 298 K?
1
29.8 J
2
100.0 J
3
298.0 J
4
115.0 J
08
PYQ 2020
medium
chemistry ID: mht-cet-
In the reaction: If 33.6 L of oxygen gas is liberated at S.T.P., what is the mass of KClO produced?
1
48.0 g
2
7.45 g
3
24.0 g
4
74.5 g
09
PYQ 2020
medium
chemistry ID: mht-cet-
Which of the following equations has and same ?
1
2
3
4
10
PYQ 2020
medium
chemistry ID: mht-cet-
The oxidation state of phosphorus in pyrophosphorus acid is
1
+3
2
+1
3
+4
4
+5
11
PYQ 2020
medium
chemistry ID: mht-cet-
what is the enthalpy change of the system?
1
2
3
4
12
PYQ 2020
medium
chemistry ID: mht-cet-
Which of the following is the strongest reducing agent?
1
Na
2
Mg
3
Li
4
Ca
13
PYQ 2020
medium
chemistry ID: mht-cet-
Which of the following statements is NOT true for glyceraldehyde?
1
It is a sugar molecule
2
It is optically active
3
It contains two asymmetric carbon atoms
4
It has carbonyl and hydroxyl group
14
PYQ 2020
medium
chemistry ID: mht-cet-
For combustion of 1 mole of liquid benzene at 298 K, the heat of reaction at constant volume is –3264.2 kJ. What is the heat of combustion at constant pressure?
( )
( )
1
–2439.2 kJ mol
2
–816.9 kJ mol
3
–3267.9 kJ mol
4
–1633.9 kJ mol
15
PYQ 2020
medium
chemistry ID: mht-cet-
Which among the following oxides of nitrogen, the nitrogen atom contains one unpaired electron?
1
2
3
4
16
PYQ 2020
medium
chemistry ID: mht-cet-
Which of the following is an intensive property?
1
Mass
2
Melting point
3
Internal energy
4
Volume
17
PYQ 2020
medium
chemistry ID: mht-cet-
What is the mass of solute (molar mass 39) in 156 g of benzene, if mole fraction of solute in benzene is 0.2? (at wt C=12, H=1, O=16)
1
15.8 g
2
19.5 g
3
22.4 g
4
10 g
18
PYQ 2020
medium
chemistry ID: mht-cet-
When will the reaction become spontaneous at all temperatures?
1
2
3
4
19
PYQ 2020
medium
chemistry ID: mht-cet-
Heat of formation of H O is = -270 kJ mol . How much water can be decomposed by 675 kJ of heat?
1
45 g
2
40 g
3
27 g
4
33 g
20
PYQ 2020
medium
chemistry ID: mht-cet-
When will the change in Gibb’s free energy always be negative?
1
2
and both positive at low temperature.
3
4
and both negative at high temperature.
21
PYQ 2020
medium
chemistry ID: mht-cet-
If and for the reaction is and respectively, what is the value of for this reaction at ?
1
2
3
4
22
PYQ 2020
medium
chemistry ID: mht-cet-
Thermodynamics deals with
1
the path between the two states of the system
2
microscopic properties of the system
3
rates at which physical and chemical processes occur
4
macroscopic properties of the system
23
PYQ 2020
medium
chemistry ID: mht-cet-
Which of the following set of parameters indicate spontaneity of reaction at all temperatures?
1
ΔH = +ve, ΔS = −ve, ΔG = +ve
2
ΔH = +ve, ΔS = +ve, ΔG = −ve
3
ΔH = −ve, ΔS = −ve, ΔG = +ve
4
ΔH = −ve, ΔS = +ve, ΔG = −ve
24
PYQ 2020
medium
chemistry ID: mht-cet-
For a reaction and , at what temperature does the reaction change from spontaneous to non-spontaneous?
1
777.0 K
2
675.0 K
3
666.6 K
4
375.0 K
25
PYQ 2020
medium
chemistry ID: mht-cet-
Average bond enthalpy of water is . If the energy required to break the first O–H bond is , how much energy per mole is required to break the second O–H bond?
1
929 kJ
2
251 kJ
3
427 kJ
4
678 kJ
26
PYQ 2020
medium
chemistry ID: mht-cet-
Which of the following equations is correct for heat of sublimation?
1
2
3
4
27
PYQ 2020
medium
chemistry ID: mht-cet-
When 2 moles of an ideal gas are expanded isothermally from a volume of 12.5 L to 15.0 L against constant external pressure of 760 mm Hg, calculate the amount of work done in joule?
1
2
3
4
28
PYQ 2020
easy
chemistry ID: mht-cet-
Enthalpy of fusion and enthalpy of vaporization for water respectively are 6.01 kJ mol and 45.07 kJ mol at 0°C. What is enthalpy of sublimation at 0°C?
29
PYQ 2020
medium
chemistry ID: mht-cet-
Number of oxygen atoms present in salicylaldehyde are
1
3
2
1
3
2
4
4
30
PYQ 2020
medium
chemistry ID: mht-cet-
Which of the following is NOT an intensive property?
1
Surface tension
2
Density
3
Refractive index
4
Heat capacity
31
PYQ 2020
medium
chemistry ID: mht-cet-
Match the pairs of proteins and their types in Column-I and Column-II. Choose the correct option.
Column-I Column-II
(a) Structural (i) Immunoglobulin
(b) Contractile (ii) Myoglobin
(c) Transport (iii) Keratin
(d) Defensive (iv) Myosin
Column-I Column-II
(a) Structural (i) Immunoglobulin
(b) Contractile (ii) Myoglobin
(c) Transport (iii) Keratin
(d) Defensive (iv) Myosin
1
a-(i), b-(ii), c-(iii), d-(iv)
2
a-(i), b-(iv), c-(ii), d-(iii)
3
a-(iv), b-(iii), c-(ii), d-(i)
4
a-(iii), b-(iv), c-(ii), d-(i)
32
PYQ 2020
medium
chemistry ID: mht-cet-
Which of the following is an extensive property?
1
Specific heat
2
Volume
3
Density
4
Surface tension
33
PYQ 2020
medium
chemistry ID: mht-cet-
Self-incompatibility is observed in ______.
1
Orchids
2
Callistemon
3
Salvia
4
Cestrum
34
PYQ 2020
medium
chemistry ID: mht-cet-
What type of intermolecular force is present between magnesium chloride and water?
1
Dipole-dipole interaction
2
Ion-dipole interaction
3
Dipole-induced dipole interaction
4
Hydrogen bonding
35
PYQ 2020
medium
chemistry ID: mht-cet-
Calculate the amount of work done during isothermal expansion of a gas from a volume of 4 dm to 6 dm against a constant external pressure of 3 atmosphere.
1
-30.4 J
2
-60.8 J
3
-607.8 J
4
-6.0 J
36
PYQ 2020
medium
chemistry ID: mht-cet-
What is the value of for the following reaction at 300 K?
1
68.2 \, \text{JK}^{-1}
2
98.3 \, \text{JK}^{-1}
3
8.32 \, \text{JK}^{-1}
4
-10.0 \, \text{JK}^{-1}
37
PYQ 2020
medium
chemistry ID: mht-cet-
For the following reaction, the relation between and is
1
2
3
4
38
PYQ 2020
medium
chemistry ID: mht-cet-
In an isothermal and reversible process, kg O expands from 10 dm to 100 dm at 300 K, work done in the process is (R = 8.314 J/mol·K)
1
-1436 J
2
-5744 J
3
-4308 J
4
-2872 J
39
PYQ 2020
medium
chemistry ID: mht-cet-
Which is true for heat and temperature?
1
Extensive and intensive properties respectively
2
Intensive and extensive properties respectively
3
Both are extensive properties
4
Both are intensive properties
40
PYQ 2020
medium
chemistry ID: mht-cet-
What is the oxidation number of Ru in [Ru(NH ) H O]Cl ?
1
+6
2
+5
3
+1
4
+2
41
PYQ 2022
easy
chemistry ID: mht-cet-
In which thermodynamic process, there is no exchange of heat between the system and surroundings?
1
Isothermal
2
Adiabatic
3
Isochoric
4
Isobaric
42
PYQ 2022
easy
chemistry ID: mht-cet-
Under isothermal conditions a gas expands from 0.2 dm3 to 0.8 dm3 against a constant pressure of 2 bar at 300 K. Find the work done by the gas.(1 dm3 bar = 100 J)
1
160 J
2
–120 J
3
–40 J
4
20 J
43
PYQ 2022
easy
chemistry ID: mht-cet-
In an adiabatic expansion of a gas initial and final temperatures are T1 and T2 respectively then the change in internal energy of the gas is [R = gas constant, γ = adiabatic ratio]
1
R (T1 - T2)
2
3
4
zero
44
PYQ 2023
easy
chemistry ID: mht-cet-
∆H and ∆S were given, find ∆G (Gibbs energy).
45
PYQ 2024
medium
chemistry ID: mht-cet-
Which is an adiabatic process?
1
The free expansion of a gas into a vacuum.
2
The reversible isothermal expansion of an ideal gas.
3
The slow compression of a gas in a cylinder fitted with a frictionless piston
4
The rapid compression of a gas in a cylinder fitted with a frictionless piston.
46
PYQ 2024
medium
chemistry ID: mht-cet-
If the activation energy for the forward reaction is and that of the reverse reaction is , what is the enthalpy change for the reaction?
1
2
3
4
47
PYQ 2024
medium
chemistry ID: mht-cet-
Which of the following correctly represents the change in Gibbs free energy (ΔG) for a spontaneous process?
1
2
3
4
48
PYQ 2025
medium
chemistry ID: mht-cet-
When 0.01 mole of nonvolatile solute is dissolved in certain solvent calculate the mass of solvent in kg if and for solvent
1
2
3
4
49
PYQ 2025
hard
chemistry ID: mht-cet-
A gas is compressed from an initial volume of 10 L to 5 L. The pressure during the compression is constant at 2 atm. Calculate the work done on the gas.
1
20 L·atm
2
10 L·atm
3
5 L·atm
4
15 L·atm
50
PYQ 2025
medium
chemistry ID: mht-cet-
The enthalpy of vaporization of water is 40.79 kJ/mol. How much heat is required to vaporize 2 moles of water at its boiling point?
1
40.79 kJ
2
81.58 kJ
3
20.39 kJ
4
10.39 kJ
51
PYQ 2025
medium
chemistry ID: mht-cet-
The enthalpy change for the reaction is . If the standard enthalpies of formation of and are and respectively, what is the standard enthalpy of formation of ?
1
2
3
4
52
PYQ 2025
medium
chemistry ID: mht-cet-
What is the enthalpy change ( ) for an exothermic reaction?
1
Positive
2
Negative
3
Zero
4
Infinite
53
PYQ 2025
medium
chemistry ID: mht-cet-
Calculate the change in internal energy of the system if 20 kJ work is done on the system and it releases 10 kJ heat in a particular reaction.
1
20 kJ
2
40 kJ
3
10 kJ
4
30 kJ
54
PYQ 2025
medium
chemistry ID: mht-cet-
The enthalpy of formation of hydrogen chloride (HCl) is . If 2 moles of HCl are formed from hydrogen and chlorine gas, calculate the total heat released.
1
2
3
4
55
PYQ 2025
medium
chemistry ID: mht-cet-
Which from following compounds has lowest value?
1
N -Ethylethanamine
2
Propan-2-amine
3
4
Benzenamine
About Thermodynamics - MHT-CET
Thermodynamics is a vital chapter for MHT-CET 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.
Frequently Asked Questions
Why focus on Thermodynamics PYQs?
Analyzing PYQs for this specific chapter reveals the most frequently tested concepts and the typical complexity of questions, allowing you to tailor your study plan efficiently.
How to best use this analysis?
Review the topic breakdown to see which sub-topics within Thermodynamics carry the most weight. Then, tackle the questions iteratively to solidify your understanding.