Thermodynamics PYQs - Last 5 Years
NEET / Chemistry / Physical Chemistry / 19 recent questions
ChemistryPhysical Chemistry2022-2026
Practice 19 NEET 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 19 of 19 filtered questions.
1Thermodynamics
\(\text { Consider the reversible processes for } 1.0 \mathrm{~mol} \text { of an ideal gas as shown in the figure. }\)
$w_1, w_2, w_3$ and $w_4$ represent work done (in calories) in the processes $1,2,3$ and 4 , respectively; $\Delta U_...
$w_1, w_2, w_3$ and $w_4$ represent work done (in calories) in the processes $1,2,3$ and 4 , respectively; $\Delta U_...
MCQ+4 / -12026
2Thermodynamics
A protein undergoes reversible thermal denaturation from its initial state $\mathbf{N}$ to denatured state $\mathbf{D}$ according to $\mathbf{N} \rightleftharpoons \mathbf{D}$. At $60^{\circ} \mathrm{C}$, the concentrations of both $\mathbf...
MCQ+4 / -12026
3Thermodynamics
Two moles of an ideal gas undergo free expansion from 10 L to 100 L at 300 K . The values of $\Delta \mathrm{S}_{\text {system }}$ and $\Delta \mathrm{S}_{\text {surroundings }}$ are
( $R$ is universal gas constant)
( $R$ is universal gas constant)
MCQ+4 / -12026
4Thermodynamics
At a certain temperature, $\mathrm{T}(\mathrm{K})$, during a process, 500 J is absorbed by the system and work of 200 J is done by the system. Then change in internal energy of the system is :
MCQ+4 / -12026
5Thermodynamics
Consider the following reaction :
$$ \begin{aligned} & 2 \mathrm{~A}(\mathrm{~g})+\mathrm{B}(\mathrm{~g}) \rightarrow 2 \mathrm{D}(\mathrm{~g}) \\ & \Delta \mathrm{U}^{\ominus}=-10 \mathrm{~kJ} \mathrm{~mol}^{-1} \text { and } \Delta \mathr...
$$ \begin{aligned} & 2 \mathrm{~A}(\mathrm{~g})+\mathrm{B}(\mathrm{~g}) \rightarrow 2 \mathrm{D}(\mathrm{~g}) \\ & \Delta \mathrm{U}^{\ominus}=-10 \mathrm{~kJ} \mathrm{~mol}^{-1} \text { and } \Delta \mathr...
MCQ+4 / -12026
6Thermodynamics
$\mathrm{C}(\mathrm{s})+2 \mathrm{H}_2(\mathrm{~g}) \rightarrow \mathrm{CH}_4(\mathrm{~g}) ; \Delta \mathrm{H}=-74.8 \mathrm{~kJ} \mathrm{~mol}^{-1}$. Which of the following diagrams gives an accurate representation of the above reaction? [...
MCQ+4 / -12025
7Thermodynamics
The standard heat of formation, in $\mathrm{kcal} / \mathrm{mol}$ of $\mathrm{Ba}^{2+}$ is :
[Given : standard heat of formation of $\mathrm{SO}_4^{2-}$ ion $(\mathrm{aq})=-216 \mathrm{kcal} / \mathrm{mol}$, standard heat of crystallisation...
[Given : standard heat of formation of $\mathrm{SO}_4^{2-}$ ion $(\mathrm{aq})=-216 \mathrm{kcal} / \mathrm{mol}$, standard heat of crystallisation...
MCQ+4 / -12025
8Thermodynamics
For the following reaction at \(300 \mathrm{~K}\)
\(\mathrm{A}_2(\mathrm{~g})+3 \mathrm{~B}_2(\mathrm{~g}) \rightarrow 2 \mathrm{AB}_3(\mathrm{~g})\)
the enthalpy change is \(+15 \mathrm{~kJ}\), then the internal energy change is :
\(\mathrm{A}_2(\mathrm{~g})+3 \mathrm{~B}_2(\mathrm{~g}) \rightarrow 2 \mathrm{AB}_3(\mathrm{~g})\)
the enthalpy change is \(+15 \mathrm{~kJ}\), then the internal energy change is :
MCQ+4 / -12024
9Thermodynamics
For an endothermic reaction:
(A) \(\mathrm{q}_{\mathrm{p}}\) is negative.
(B) \(\Delta_{\mathrm{r}} \mathrm{H}\) is positive.
(C) \(\Delta_r \mathrm{H}\) is negative.
(D) \(\mathrm{q}_{\mathrm{p}}\) is positive.
Choose the correct answer fr...
(A) \(\mathrm{q}_{\mathrm{p}}\) is negative.
(B) \(\Delta_{\mathrm{r}} \mathrm{H}\) is positive.
(C) \(\Delta_r \mathrm{H}\) is negative.
(D) \(\mathrm{q}_{\mathrm{p}}\) is positive.
Choose the correct answer fr...
MCQ+4 / -12024
10Thermodynamics
Choose the correct statement for the work done in the expansion and heat absorbed or released when
5 litres of an ideal gas at 10 atmospheric pressure isothermally expands into vacuum until volume is
15 litres :
5 litres of an ideal gas at 10 atmospheric pressure isothermally expands into vacuum until volume is
15 litres :
MCQ+4 / -12024
11Thermodynamics
The work done during reversible isothermal expansion of one mole of hydrogen gas at \(25^{\circ} \mathrm{C}\) from pressure of 20 atmosphere to 10 atmosphere is (Given \(\mathrm{R}=2.0 \mathrm{~cal} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}\))
MCQ+4 / -12024
12Thermodynamics
Match List I with List II.
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.tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px;
overflow:hidden;padding:10px 5px;word-break:normal;}...
.tg {border-collapse:collapse;border-spacing:0;}
.tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px;
overflow:hidden;padding:10px 5px;word-break:normal;}...
MCQ+4 / -12024
13Thermodynamics
In which of the following processes entropy increases?
A. A liquid evaporates to vapour.
B. Temperature of a crystalline solid lowered from \(130 \mathrm{~K}\) to \(0 \mathrm{~K}\).
C. $$2 \mathrm{NaHCO}_{3(\mathrm{~s})} \rightarrow \mathrm...
A. A liquid evaporates to vapour.
B. Temperature of a crystalline solid lowered from \(130 \mathrm{~K}\) to \(0 \mathrm{~K}\).
C. $$2 \mathrm{NaHCO}_{3(\mathrm{~s})} \rightarrow \mathrm...
MCQ+4 / -12024
14Thermodynamics
Consider the following reaction :-
\(2 \mathrm{H}_2(\mathrm{~g})+\mathrm{O}_2(\mathrm{~g}) \rightarrow 2 \mathrm{H}_2 \mathrm{O}(\mathrm{g}) \Delta_{\mathrm{r}} \mathrm{H}^{\circ}=-483.64 \mathrm{~kJ} \text {. }\)
What is the enthalpy chang...
\(2 \mathrm{H}_2(\mathrm{~g})+\mathrm{O}_2(\mathrm{~g}) \rightarrow 2 \mathrm{H}_2 \mathrm{O}(\mathrm{g}) \Delta_{\mathrm{r}} \mathrm{H}^{\circ}=-483.64 \mathrm{~kJ} \text {. }\)
What is the enthalpy chang...
MCQ+4 / -12023
15Thermodynamics
Which amongst the following options is the correct relation between change in enthalpy and change in internal energy?
MCQ+4 / -12023
16Thermodynamics
The equilibrium concentrations of the species in the reaction \(\mathrm{A}+\mathrm{B} \rightleftharpoons \mathrm{C}+\mathrm{D}\) are \(2,3,10\) and \(6 \mathrm{~mol}\) \(\mathrm{L}^{-1}\), respectively at $$300 \mathrm{~K} . \Delta \mathrm{...
MCQ+4 / -12023
17Thermodynamics
A vessel contains 3.2 g of dioxygen gas at STP (273.15 K and 1 atm pressure). The gas is now transferred to another vessel at constant temperature, where pressure becomes one third of the original pressure. The volume of new vessel in L is ...
MCQ+4 / -12022
18Thermodynamics
One mole of an ideal gas at 300 K is expanded isothermally from 1 L to 10 L volume. \(\Delta\)U for this process is :
(Use R = 8.314 J k\(-\)1 mol\(-\)1)
(Use R = 8.314 J k\(-\)1 mol\(-\)1)
MCQ+4 / -12022
19Thermodynamics
Which of the following p-V curve represents maximum work done?
MCQ+4 / -12022