Match the List-I with List-II List-I (Isothermal process for ideal gas system) | List-II Work done ($\mathbf{V}_{\mathbf{f}} \boldsymbol{>} \mathbf{V}_{\mathbf{i}}$) Choose the correct answer from the options given below :

For an isothermal ideal gas, reversible expansion does the maximum work , matching (II). Free expansion takes place against zero external pressure, so , matching (I). Irreversible expansion against a constant external pressure gives , matching (III). Irreversible compression against a constant exte…

JEE Main · 2026 · 24 Jan 2026 · Shift 1 · Chemical Thermodynamics

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Match the List-I with List-II

List-I (Isothermal process for ideal gas system) | List-II Work done (

V_{f} > V_{i}

)

Choose the correct answer from the options given below :

Answer: A → II, B → I, C → III, D → IV

Solution

For an isothermal ideal gas, reversible expansion does the maximum work

w = - n R T ln \frac{V _{f}}{V _{i}}

, matching (II). Free expansion takes place against zero external pressure, so

w = 0

, matching (I). Irreversible expansion against a constant external pressure gives

w = - p_{e x} (V_{f} - V_{i})

, matching (III). Irreversible compression against a constant external pressure gives

w = - p_{e x} (V_{i} - V_{f})

, matching (IV). The correct pairing is A-II, B-I, C-III, D-IV.

JEE Main · 2026 · 24 Jan 2026 · Shift 1 · Match the columns

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JEE Main · 2026 · 24 Jan 2026 · Shift 1 · Chemical Thermodynamics

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