Thermodynamics PYQs - Last 5 Years
JEE Main / Chemistry / Physical Chemistry / 123 recent questions
ChemistryPhysical Chemistry2022-2026
Practice 123 JEE Main Chemistry questions from Thermodynamics. Use the year-wise and type-wise breakdown to prioritize recent PYQs, then continue into the question list below.
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Last 5 Years Thermodynamics Questions
Showing 50 of 123 filtered questions.
1Thermodynamics
A liquid when kept inside a thermally insulated closed vessel at $25^{\circ} \mathrm{C}$ was mechanically stirred from outside. What will be the correct option for the following thermodynamic parameters ?
MCQ+4 / -12025
2Thermodynamics
Consider the following cases of standard enthalpy of reaction $\left(\Delta \mathrm{H}_{\mathrm{r}}^{\circ}\right.$ in $\left.\mathrm{kJ} \mathrm{mol}^{-1}\right)$
$$\begin{aligned}
& \mathrm{C}_2 \mathrm{H}_6(\mathrm{~g})+\frac{7}{2} \math...
$$\begin{aligned}
& \mathrm{C}_2 \mathrm{H}_6(\mathrm{~g})+\frac{7}{2} \math...
INTEGER+4 / -12025
3Thermodynamics
Match List - I with List - II.
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MCQ+4 / -12025
4Thermodynamics
When equal volume of \(1 \mathrm{~M} \mathrm{~HCl}\) and \(1 \mathrm{~M} \mathrm{~H}_2 \mathrm{SO}_4\) are separately neutralised by excess volume of \(1 \mathrm{M}\) \(\mathrm{NaOH}\) solution. \(x\) and \(y \mathrm{~kJ}\) of heat is liber...
INTEGER+4 / -12024
5Thermodynamics
The heat of solution of anhydrous \(\mathrm{CuSO}_4\) and \(\mathrm{CuSO}_4 \cdot 5 \mathrm{H}_2 \mathrm{O}\) are \(-70 \mathrm{~kJ} \mathrm{~mol}^{-1}\) and \(+12 \mathrm{~kJ} \mathrm{~mol}^{-1}\) respectively.
The heat of hydration of $$\...
The heat of hydration of $$\...
INTEGER+4 / -12024
6Thermodynamics
When \(\Delta \mathrm{H}_{\mathrm{vap}}=30 \mathrm{~kJ} / \mathrm{mol}\) and \(\Delta \mathrm{S}_{\mathrm{vap}}=75 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\), then the temperature of vapour, at one atmosphere is _________ K.
INTEGER+4 / -12024
7Thermodynamics
Consider the figure provided.
\(1 \mathrm{~mol}\) of an ideal gas is kept in a cylinder, fitted with a piston, at the position A, at \(18^{\circ} \mathrm{C}\). If the piston is moved to position \(\mathrm{B}\), keeping the temperature unch...
INTEGER+4 / -12024
8Thermodynamics
\(\Delta_{\text {vap }} \mathrm{H}^{\ominus}\) for water is \(+40.79 \mathrm{~kJ} \mathrm{~mol}^{-1}\) at 1 bar and \(100^{\circ} \mathrm{C}\). Change in internal energy for this vapourisation under same condition is ________ $$\mathrm{kJ} ...
INTEGER+4 / -12024
9Thermodynamics
An ideal gas, \(\overline{\mathrm{C}}_{\mathrm{v}}=\frac{5}{2} \mathrm{R}\), is expanded adiabatically against a constant pressure of 1 atm untill it doubles in volume. If the initial temperature and pressure is \(298 \mathrm{~K}\) and $$5 ...
INTEGER+4 / -12024
10Thermodynamics
For the reaction at \(298 \mathrm{~K}, 2 \mathrm{~A}+\mathrm{B} \rightarrow \mathrm{C}, \Delta \mathrm{H}=400 \mathrm{~kJ} \mathrm{~mol}^{-1}\) and \(\Delta S=0.2 \mathrm{~kJ} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\). The reaction will become ...
INTEGER+4 / -12024
11Thermodynamics
Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R)
Assertion (A) : Enthalpy of neutralisation of strong monobasic acid with strong monoacidic base is always $$-57 \mathrm{~kJ} \mathrm{~m...
Assertion (A) : Enthalpy of neutralisation of strong monobasic acid with strong monoacidic base is always $$-57 \mathrm{~kJ} \mathrm{~m...
MCQ+4 / -12024
12Thermodynamics
The heat of combustion of solid benzoic acid at constant volume is \(-321.30 \mathrm{~kJ}\) at \(27^{\circ} \mathrm{C}\). The heat of combustion at constant pressure is \((-321.30-x \mathrm{R}) \mathrm{~kJ}\), the value of \(x\) is ________...
INTEGER+4 / -12024
13Thermodynamics
Combustion of 1 mole of benzene is expressed at
\(\mathrm{C}_6 \mathrm{H}_6(\mathrm{l})+\frac{15}{2} \mathrm{O}_2(\mathrm{~g}) \rightarrow 6 \mathrm{CO}_2(\mathrm{~g})+3 \mathrm{H}_2 \mathrm{O}(\mathrm{l}) \text {. }\)
The standard enthalpy...
\(\mathrm{C}_6 \mathrm{H}_6(\mathrm{l})+\frac{15}{2} \mathrm{O}_2(\mathrm{~g}) \rightarrow 6 \mathrm{CO}_2(\mathrm{~g})+3 \mathrm{H}_2 \mathrm{O}(\mathrm{l}) \text {. }\)
The standard enthalpy...
INTEGER+4 / -12024
14Thermodynamics
The enthalpy of formation of ethane \((\mathrm{C}_2 \mathrm{H}_6)\) from ethylene by addition of hydrogen where the bond-energies of \(\mathrm{C}-\mathrm{H}, \mathrm{C}-\mathrm{C}, \mathrm{C}=\mathrm{C}, \mathrm{H}-\mathrm{H}\) are $$414 \m...
INTEGER+4 / -12024
15Thermodynamics
Three moles of an ideal gas are compressed isothermally from \(60 \mathrm{~L}\) to \(20 \mathrm{~L}\) using constant pressure of \(5 \mathrm{~atm}\). Heat exchange \(\mathrm{Q}\) for the compression is - _________ Lit. atm.
INTEGER+4 / -12024
16Thermodynamics
Consider the following reaction at \(298 \mathrm{~K} \cdot \frac{3}{2} \mathrm{O}_{2(g)} \rightleftharpoons \mathrm{O}_{3(g)} \cdot \mathrm{K}_{\mathrm{P}}=2.47 \times 10^{-29}\). \(\Delta_r G^{\ominus}\) for the reaction is _________ $$\ma...
INTEGER+4 / -12024
17Thermodynamics
If 5 moles of an ideal gas expands from \(10 \mathrm{~L}\) to a volume of \(100 \mathrm{~L}\) at \(300 \mathrm{~K}\) under isothermal and reversible condition then work, \(\mathrm{w}\), is \(-x \mathrm{~J}\). The value of \(x\) is _________...
INTEGER+4 / -12024
18Thermodynamics
An ideal gas undergoes a cyclic transformation starting from the point A and coming back to the same point by tracing the path \(\mathrm{A} \rightarrow \mathrm{B} \rightarrow \mathrm{C} \rightarrow \mathrm{A}\) as shown in the diagram abov...
INTEGER+4 / -12024
19Thermodynamics
Two reactions are given below:
$$\begin{aligned}
& 2 \mathrm{Fe}_{(\mathrm{s})}+\frac{3}{2} \mathrm{O}_{2(\mathrm{~g})} \rightarrow \mathrm{Fe}_2 \mathrm{O}_{3(\mathrm{~s})}, \Delta \mathrm{H}^{\circ}=-822 \mathrm{~kJ} / \mathrm{mol} \\
& \...
$$\begin{aligned}
& 2 \mathrm{Fe}_{(\mathrm{s})}+\frac{3}{2} \mathrm{O}_{2(\mathrm{~g})} \rightarrow \mathrm{Fe}_2 \mathrm{O}_{3(\mathrm{~s})}, \Delta \mathrm{H}^{\circ}=-822 \mathrm{~kJ} / \mathrm{mol} \\
& \...
INTEGER+4 / -12024
20Thermodynamics
Which of the following is not correct?
MCQ+4 / -12024
21Thermodynamics
Standard enthalpy of vapourisation for \(\mathrm{CCl}_4\) is \(30.5 \mathrm{~kJ} \mathrm{~mol}^{-1}\). Heat required for vapourisation of \(284 \mathrm{~g}\) of \(\mathrm{CCl}_4\) at constant temperature is ________ \(\mathrm{kJ}\).
(Given ...
(Given ...
INTEGER+4 / -12024
22Thermodynamics
If three moles of an ideal gas at \(300 \mathrm{~K}\) expand isothermally from \(30 \mathrm{~dm}^3\) to \(45 \mathrm{~dm}^3\) against a constant opposing pressure of \(80 \mathrm{~kPa}\), then the amount of heat transferred is _______ J.
INTEGER+4 / -12024
23Thermodynamics
For a certain thermochemical reaction \(\mathrm{M} \rightarrow \mathrm{N}\) at \(\mathrm{T}=400 \mathrm{~K}, \Delta \mathrm{H}^{\ominus}=77.2 \mathrm{~kJ} \mathrm{~mol}^{-1}, \Delta \mathrm{S}=122 \mathrm{~JK}^{-1}, \log\) equilibrium const...
INTEGER+4 / -12024
24Thermodynamics
Choose the correct option for free expansion of an ideal gas under adiabatic condition from the following :
MCQ+4 / -12024
25Thermodynamics
For a certain reaction at $300 \mathrm{~K}, \mathrm{~K}=10$, then $\Delta \mathrm{G}^{\circ}$ for the same reaction is - ____________ $\times 10^{-1} \mathrm{~kJ} \mathrm{~mol}^{-1}$. (Given $\mathrm{R}=8.314 \mathrm{JK}^{-1} \mathrm{~mol}^...
INTEGER+4 / -12024
26Thermodynamics
When a \(60 \mathrm{~W}\) electric heater is immersed in a gas for 100 s in a constant volume container with adiabatic walls, the temperature of the gas rises by \(5^{\circ} \mathrm{C}\). The heat capacity of the given gas is ___________ $$...
INTEGER+4 / -12023
27Thermodynamics
For complete combustion of ethene.
\(\mathrm{C}_{2} \mathrm{H}_{4}(\mathrm{g})+3 \mathrm{O}_{2}(\mathrm{g}) \rightarrow 2 \mathrm{CO}_{2}(\mathrm{g})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})\)
the amount of heat produced as measured in bomb ...
\(\mathrm{C}_{2} \mathrm{H}_{4}(\mathrm{g})+3 \mathrm{O}_{2}(\mathrm{g}) \rightarrow 2 \mathrm{CO}_{2}(\mathrm{g})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})\)
the amount of heat produced as measured in bomb ...
INTEGER+4 / -12023
28Thermodynamics
The value of \(\log \mathrm{K}\) for the reaction \(\mathrm{A} \rightleftharpoons \mathrm{B}\) at \(298 \mathrm{~K}\) is ___________. (Nearest integer)
Given: \(\Delta \mathrm{H}^{\circ}=-54.07 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
$$\Delta \ma...
Given: \(\Delta \mathrm{H}^{\circ}=-54.07 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
$$\Delta \ma...
INTEGER+4 / -12023
29Thermodynamics
Consider the graph of Gibbs free energy G vs Extent of reaction. The number of statement/s from the following which are true with respect to points (a), (b) and (c) is _________
A. Reaction is spontaneous at (a) and (b)
B. Reaction is at e...
A. Reaction is spontaneous at (a) and (b)
B. Reaction is at e...
INTEGER+4 / -12023
30Thermodynamics
Consider the following data
Heat of combustion of \(\mathrm{H}_{2}(\mathrm{g})\quad\quad=-241.8 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
Heat of combustion of \(\mathrm{C}(\mathrm{s})\quad\quad=-393.5 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
Heat of comb...
Heat of combustion of \(\mathrm{H}_{2}(\mathrm{g})\quad\quad=-241.8 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
Heat of combustion of \(\mathrm{C}(\mathrm{s})\quad\quad=-393.5 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
Heat of comb...
INTEGER+4 / -12023
31Thermodynamics
The enthalpy change for the conversion of \(\frac{1}{2} \mathrm{Cl}_{2}(\mathrm{~g})\) to \(\mathrm{Cl}^{-}\)(aq) is (\(-\)) ___________
\(\mathrm{kJ} \mathrm{mol}^{-1}\) (Nearest integer)
Given : $$\Delta_{\mathrm{dis}} \mathrm{H}_{\mathr...
\(\mathrm{kJ} \mathrm{mol}^{-1}\) (Nearest integer)
Given : $$\Delta_{\mathrm{dis}} \mathrm{H}_{\mathr...
INTEGER+4 / -12023
32Thermodynamics
Enthalpies of formation of $\mathrm{CCl}_{4}(\mathrm{~g}), \mathrm{H}_{2} \mathrm{O}(\mathrm{g}), \mathrm{CO}_{2}(\mathrm{~g})$ and $\mathrm{HCl}(\mathrm{g})$ are $-105,-242,-394$ and $-92 ~\mathrm{kJ}$ $\mathrm{mol}^{-1}$ respectively. The...
INTEGER+4 / -12023
33Thermodynamics
When 2 litre of ideal gas expands isothermally into vacuum to a total volume of 6 litre, the change in internal energy is ____________ J. (Nearest integer)
INTEGER+4 / -12023
34Thermodynamics
1 mole of ideal gas is allowed to expand reversibly and adiabatically from a temperature of $27^{\circ} \mathrm{C}$. The work done is $3 \mathrm{~kJ} \mathrm{~mol}^{-1}$. The final temperature of the gas is ________ $\mathrm{K}$ (Nearest in...
INTEGER+4 / -12023
35Thermodynamics
Which of the following relations are correct?
(A) \(\mathrm{\Delta U=q+p\Delta V}\)
(B) \(\mathrm{\Delta G=\Delta H-T\Delta S}\)
(C) \(\Delta \mathrm{S}=\frac{q_{rev}}{T}\)
(D) \(\mathrm{\Delta H=\Delta U-\Delta nRT}\)
Choose the most appro...
(A) \(\mathrm{\Delta U=q+p\Delta V}\)
(B) \(\mathrm{\Delta G=\Delta H-T\Delta S}\)
(C) \(\Delta \mathrm{S}=\frac{q_{rev}}{T}\)
(D) \(\mathrm{\Delta H=\Delta U-\Delta nRT}\)
Choose the most appro...
MCQ+4 / -12023
36Thermodynamics
An athlete is given 100 g of glucose (C\(_6\)H\(_{12}\)O\(_6\)) for energy. This is equivalent to 1800kJ of energy. The 50% of this energy gained is utilized by the athlete for sports activities at the event. In order to avoid storage of en...
INTEGER+4 / -12023
37Thermodynamics
28.0 L of CO\(_2\) is produced on complete combustion of 16.8 L gaseous mixture of ethene and methane at 25\(^\circ\)C and 1 atm. Heat evolved during the combustion process is ___________ kJ.
Given : $$\mathrm{\Delta H_c~(CH_4)=-900~kJ~mol^...
Given : $$\mathrm{\Delta H_c~(CH_4)=-900~kJ~mol^...
INTEGER+4 / -12023
38Thermodynamics
For independent process at 300 K
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INTEGER+4 / -12023
39Thermodynamics
Following figure shows spectrum of an ideal black body at four different temperatures. The number of correct statement/s from the following is ____________.
A. \(\mathrm{T_4 > T_3 > T_2 > T_1}\)
B. The black body consists of particles perf...
A. \(\mathrm{T_4 > T_3 > T_2 > T_1}\)
B. The black body consists of particles perf...
INTEGER+4 / -12023
40Thermodynamics
One mole of an ideal monoatomic gas is subjected to changes as shown in the graph. The magnitude of the work done (by the system or on the system) is __________ J (nearest integer)
Given ; \(\log2=0.3\)
\(\ln10=2.3\)
Given ; \(\log2=0.3\)
\(\ln10=2.3\)
INTEGER+4 / -12023
41Thermodynamics
At \(25^{\circ} \mathrm{C}\), the enthalpy of the following processes are given :
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INTEGER+4 / -12023
42Thermodynamics
\(0.3 \mathrm{~g}\) of ethane undergoes combustion at \(27^{\circ} \mathrm{C}\) in a bomb calorimeter. The temperature of calorimeter system (including the water) is found to rise by \(0.5^{\circ} \mathrm{C}\). The heat evolved during combu...
INTEGER+4 / -12023
43Thermodynamics
$30.4 \mathrm{~kJ}$ of heat is required to melt one mole of sodium chloride and the entropy change at the melting point is $28.4 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}$ at 1 atm. The melting point of sodium chloride is ____________...
INTEGER+4 / -12023
44Thermodynamics
\(\mathrm{A}_{2}+\mathrm{B}_{2} \rightarrow 2 \mathrm{AB} . \Delta H_{f}^{0}=-200 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
\(\mathrm{AB}, \mathrm{A}_{2}\) and \(\mathrm{B}_{2}\) are diatomic molecules. If the bond enthalpies of $$\mathrm{A}_{2}, \...
\(\mathrm{AB}, \mathrm{A}_{2}\) and \(\mathrm{B}_{2}\) are diatomic molecules. If the bond enthalpies of $$\mathrm{A}_{2}, \...
INTEGER+4 / -12023
45Thermodynamics
What happens when methane undergoes combustion in systems A and B respectively?
MCQ+4 / -12023
46Thermodynamics
One mole of an ideal gas at \(350 \mathrm{~K}\) is in a \(2.0 \mathrm{~L}\) vessel of thermally conducting walls, which are in contact with the surroundings. It undergoes isothermal reversible expansion from 2.0 L to \(3.0 \mathrm{~L}\) aga...
INTEGER+4 / -12023
47Thermodynamics
Solid fuel used in rocket is a mixture of \(\mathrm{Fe}_{2} \mathrm{O}_{3}\) and \(\mathrm{Al}\) (in ratio 1 : 2). The heat evolved \((\mathrm{kJ})\) per gram of the mixture is ____________. (Nearest integer)
Given: $$\Delta \mathrm{H}_{\ma...
Given: $$\Delta \mathrm{H}_{\ma...
INTEGER+4 / -12023
48Thermodynamics
The total number of intensive properties from the following is __________ Volume, Molar heat capacity, Molarity, \(\mathrm{E}^{\theta}\) cell, Gibbs free energy change, Molar mass, Mole
INTEGER+4 / -12023
49Thermodynamics
Given
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MCQ+4 / -12023
50Thermodynamics
The number of endothermic process/es from the following is ______________.
A. \(\mathrm{I}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{I}(\mathrm{g})\)
B. \(\mathrm{HCl}(\mathrm{g}) \rightarrow \mathrm{H}(\mathrm{g})+\mathrm{Cl}(\mathrm{g})\)
C....
A. \(\mathrm{I}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{I}(\mathrm{g})\)
B. \(\mathrm{HCl}(\mathrm{g}) \rightarrow \mathrm{H}(\mathrm{g})+\mathrm{Cl}(\mathrm{g})\)
C....
INTEGER+4 / -12023