1
JEE Main 2026 (Online) 6th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Match List - I with List - II.

Given $V_1$ and $V_2$ are initial and final volumes respectively.

List - I
(Isothermal process)
List - II
(Expression)
A. Reversible expansion I. $$
\mathrm{q}=0
$$
B. Free expansion II. $$
\mathrm{q}=\mathrm{nRT} \ln \frac{\mathrm{~V}_2}{\mathrm{~V}_1}
$$
C. Irreversible Compression III. $$
\mathrm{w}=-\mathrm{p}_{\mathrm{ext}}\left(\mathrm{~V}_1-\mathrm{V}_2\right)
$$
D. Cyclic reversible IV. $$
\frac{\mathrm{q}_{\mathrm{rev}}}{\mathrm{~T}}=0
$$

Choose the correct answer from the options given below :

A

A-II, B-III, C-I, D-IV

B

A-II, B-I, C-IV, D-III

C

A-II, B-I, C-III, D-IV

D

A-I, B-II, C-III, D-IV

2
JEE Main 2026 (Online) 6th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Arrange the following isothermal processes in order of the magnitude of the work $(\mathrm{p}-\mathrm{V})$ involved between states 1 and 2.

A. Expansion in single stage $\mathrm{w}_{\mathrm{A}}$

B. Expansion in multi stages $w_B$

C. Compression in single stage $\mathrm{w}_{\mathrm{C}}$

D. Compression in multi stages $w_D$

Choose the correct option.

A

$$ \left|w_B\right|>\left|w_A\right|>\left|w_C\right|>\left|w_D\right| $$

B

$$ \left|w_C\right|>\left|w_D\right|>\left|w_A\right|>\left|w_B\right| $$

C

$$ \left|w_C\right|>\left|w_D\right|>\left|w_B\right|>\left|w_A\right| $$

D

$$ \left|w_B\right|>\left|w_A\right|>\left|w_D\right|>\left|w_C\right| $$

3
JEE Main 2026 (Online) 5th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Consider the following data for the reaction

$$ X_2(g)+Y_2(g) \rightleftharpoons 2 X Y(g) $$

at $600 \mathrm{~K}^{\circ}$. The $\Delta_{\mathrm{r}} \mathrm{G}^{\ominus}$ (in $\mathrm{kJ} \mathrm{mol}^{-1}$ ) for the reaction is :

$$ \begin{array}{|c|c|c|} \hline \text { Compound } & \Delta_f \mathrm{H}_{600 \mathrm{~K}}^{\ominus}\left(\mathrm{kJ} \mathrm{~mol}^{-1}\right) & \mathrm{S}^{\ominus}{ }_{600 \mathrm{~K}}\left(\mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\right) \\ \hline \mathrm{XY}(\mathrm{~g}) & 42 & 200 \\ \hline \mathrm{X}_2(\mathrm{~g}) & 8 & 140 \\ \hline \mathrm{Y}_2(\mathrm{~g}) & 80 & 250 \\ \hline \end{array} $$

A

-21000

B

-10

C

-1000

D

-9.012

4
JEE Main 2026 (Online) 5th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The correct order of molar heat capacities measured at 298 K and 1 bar is :

A

Copper(s) $>$ Bromine(l) $>$ Helium(g)

B

Bromine(l) > Copper(s) > Helium(g)

C

Helium(g) > Bromine(l) > Copper(s)

D

Helium(g) > Bromine(l) = Copper(s)

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