Which of the following statement(s) is/are true?

Options

A. All adiabatic process are isoentropic (or isentropic) processes
B. When `(DeltaG_("system"))_(T,P)lt0,` the reaction must be exothermic
C. dG=VdP-SdT is applicable for closed system, both PV and non-PV work
D. The heat of vaporisation of water at `100^(@)C` is 40.6 kJ/mol. When 9 gm of water vapour condenses to liquid at `100^(@)C` and 1 atm, then `DeltaS_("system")` = 54.42 J/K

Answer

A, B, C, D

Explanation

(a) Reversible adiabatic process is iso-entropic process
(b) When `(DeltaG_("system"))_(T,P)lt0` then process may be endothermic / exothermic
(c )`dG=VdP -SdT`, only PV work consider
(d) `DeltaS=-(9)/(18)xx(40.6 xx 1000)/(373)=-54.42`