JEE Main 2026 · 6 Apr · Shift 2 · Chemistry Q54

ChemistryList match+4 / -1Question 54 of 75

Match List - I with List - II.

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

Choose the correct answer from the options given below :

List - I (Isothermal process)

List - II (Expression)

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

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

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

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

Answer and worked solution

Official answer: C

Each isothermal process.

A: Reversible expansion: $q=nRT\ln\dfrac{V_2}{V_1}$ (II).
B: Free expansion: $w=0$ and $\Delta U=0$ , so $q=0$ (I).
C: Irreversible compression against $p_{ext}$ (III). With the usual convention $w=-p_{ext}(V_2-V_1)$ ; III is printed with $V_1-V_2$ .
D: Cyclic reversible: $\oint\dfrac{q_{rev}}T=0$ (IV).

Match: A-II, B-I, C-III, D-IV.

(C)

Topics:First law and enthalpy Entropy

JEE Main 2026 · 6 Apr · Shift 2, Chemistry question 54