Which of the following p-V curve represents maximum work done ? 1. [graph in figure] 2. [graph in figure] 3. [graph in figure] 4. [graph in figure]

Topic: First law: work, heat, internal energy, enthalpy· Chemical Thermodynamics

Which of the following p-V curve represents maximum work done ?

four p-V graphs each with an isothermal curve

1. [graph in figure]

2. [graph in figure]

3. [graph in figure]

4. [graph in figure]

Doubtly Asked 30 Oct 2026 NEET UG 2022 Practice test neet Save WhatsApp Report

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Answer: 3. [graph in figure]

Key idea: work done by the gas equals the area under the p-V curve, so find the graph with the largest area.

Graph (3) shows a constant-pressure expansion at the highest pressure followed by an isothermal expansion over a long volume range, down to a low final pressure. Its area is the largest. Graph (1) has a small volume change, graph (2) is a closed loop with only small net work, and graph (4) is a vertical line (no volume change, zero work).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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Which of the following p-V curve represents maximum work done ?

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