Q.

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

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a

Adiabatic process : w=0

b

Cyclic process : U=0

c

Isothermal process : q=-w

d

Isochoric process : U=q

answer is D.

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Detailed Solution

According to the first law of thermodynamics q=ΔU-w

 For cyclic process : ΔU=0q=-w

 For isothermal process : ΔU=0q=-w

 For adiabatic process : q=0ΔU=W

 For isochoric process : w=0ΔU=q

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