ChemistryJEE Main 6 Apr 2026, Shift 2·Q4·MCQ·Easy–moderate

Thermodynamics · Isothermal process work and heat

Match List-I with List-II

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

List-I		List-II
(Isothermal process)		(Expression)
A.	Reversible expansion	I.	$q = 0$
B.	Free expansion	II.	$q = nRT\ln\dfrac{V_2}{V_1}$
C.	Irreversible Compression	III.	$w = -p_\mathrm{ext}\left(V_2 - V_1\right)$
D.	Cyclic reversible	IV.	$\dfrac{q_\mathrm{rev}}{T} = 0$

Choose the correct answer from the options given below :

(1)A-II, B-III, C-I, D-IV
(2)A-II, B-I, C-IV, D-III
(3)A-II, B-I, C-III, D-IV
(4)A-I, B-II, C-III, D-IV

We corrected a printing error in the original paper

Source printed expression III as “ $w = -p_\mathrm{ext}(V_1 - V_2)$ ” (wrong sign for $V_1$ initial, $V_2$ final); corrected to the intended “ $w = -p_\mathrm{ext}(V_2 - V_1)$ ”.

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See the full 6 Apr 2026, Shift 2 paper