AIIMS 2013 Chemistry Question Paper for free online practice with solutions

H and U are state functions but W and q are not state functions.
From the equation, ΔH=ΔU+ΔPV
At constant volume, ΔH=ΔU+VΔP
At constant pressure, ΔP=0,ΔH=qp
so, it is a state function.
At constant volume, ΔV=0,ΔU=qp
so, it is a state function
Work done in any adiabatic process is state function.
ΔU=q−W (∴q=0)
ΔU=−W
Work done in isothermal process is not a state function.
W=−p (∴ΔT=0,q≠0)