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