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Question:

Which one of the following equations does not correctly represent the first law of thermodynamics for the given processes involving an ideal gas?

Adiabatic process: ΔU=-w

Isothermal process :q=-w

Cylic process :q=-w

Isochoric process: ΔU=q

Solution:

Correct option is C. Adiabatic process: ΔU=-w
Solution:- (C) Adiabatic process: ΔU=-w
For:
Cyclic process :ΔU=0 ⇒ q=-w
Isothermal process :ΔU=0 ⇒ q=-w
Adiabatic process: q=0 ⇒ ΔU=w
Isochoric process : w=0 ⇒ ΔU=q