The correct option is D I - P, Q, U
(I) → Q,U
(II) → P, S, T
(III) → R, S, T, U
(IV)→ R, T, U
(I) For reversibale isothermal expansion:
ΔT=0,ΔH=0,ΔU=0,q≠0,
ΔSTotal=0,ΔSsys>0,ΔSsurr<0
Hence (I) →Q,U
For reversible adiabatic compression of a real gas :
q=0,ΔSTotal=0,ΔSsys=0,ΔSsurr=0,
ΔT≠0,ΔH≠0,ΔU≠o
Hence (II) →P,S,T
(III) For Adiabatic Free expansion :
q=0,w=0,ΔU=0
ΔH=0 (for Ideal gas)
ΔH≠0 (for other cases)
ΔSsys.>0,ΔSsurr.=0,ΔSTotal>0
Hence, (III) →R,S,T,U
(IV) For Isothermal Free expansion :
q≠0,w=0,ΔU=0,ΔT=0
ΔH=0 (for Ideal gas)
ΔH≠0 (for other cases)
ΔSsys.>0,ΔSsurr.=0,ΔSTotal>0
Hence (IV) →R,T,U