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A thermo-dynamical system is changed from state (P1,V1) to (P2,V2) by two different process. The quantity which will remain same will be 

a
Δ Q
b
Δ W
c
ΔQ+ΔW
d
ΔQ−ΔW

detailed solution

Correct option is D

Change in internal energy does not depend upon path so ΔU=ΔQ−ΔW remain constant.

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