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Question:

Which of the following options is the only correct representation of a process in which ΔU=ΔQ−PΔV?

(II)(iii)(P)

(II)(iii)(S)

(III)(iii)(P)

(II)((iv)(R)

Solution:

I: Work done by adiabatic process:W₁₋₂=(P₂V₂−P₁V₁/γ)
II: Work done by isobaric process:W₁₋₂=−PV₂+PV₁=PΔV
III : Work done by isochoric Process :W₁₋₂=0. As the volume is constant throughout the process.
IV: Work done by isothermal :W₁₋₂=−nRT ln(V₂/V₁)