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ChemistryJEE Main 24 Jan 2026, Shift 1·Q13·MCQ·Easy–moderate

Thermodynamics · Isothermal work reversible irreversible

Match the List-I with List-II
List-IList-II
(Isothermal processWork done (Vf>Vi\boldsymbol{V_\mathrm{f} > V_\mathrm{i}})
for ideal gas system)
A.Reversible expansionI.w=0w = 0
B.Free expansionII.w=−nRTln⁡VfViw = -nRT\ln\dfrac{V_\mathrm{f}}{V_\mathrm{i}}
C.Irreversible expansionIII.w=−pex (Vf−Vi)w = -p_\mathrm{ex}\,(V_\mathrm{f} - V_\mathrm{i})
D.Irreversible compressionIV.w=−pex (Vi−Vf)w = -p_\mathrm{ex}\,(V_\mathrm{i} - V_\mathrm{f})
Choose the correct answer from the options given below :
  1. (1)A-IV, B-I, C-III, D-II
  2. (2)A-IV, B-II, C-III, D-I
  3. (3)A-I, B-III, C-II, D-IV
  4. (4)A-II, B-I, C-III, D-IV

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See the full 24 Jan 2026, Shift 1 paper