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Which one of the following equations does not correctly represent the first law of thermodynamics for the given processes involving an ideal gas ? (Assume non-expansion work is zero)

1. Adiabatic process : Δ U = –w
2. Cyclic process : q = – w
3. Isothermal process : q = – w
4. Isochoric process : Δ U = q

Correct answer: Adiabatic process : Δ U = –w

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