For isothermal process of ideal gas: ΔU = 0 (as ΔT = 0). From first law: ΔU = q + w, so q = -w
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JEE Main 2023 — Chemistry Physical Chemistry
medium
mcq
2023
Official previous-year question
Verified 30 May 2026.
Question
For an isothermal reversible expansion of an ideal gas, which of the following is true?
Options
- AΔU = 0, q = -w
- BΔU = q, w = 0
- CΔU = w, q = 0
- DΔU = q + w = 0
Solution
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