During expansion of a gas into vaccum (P_("ext")=0), Work done is zero if the process is (A) Reversible (B) Irreversible (C ) Isothermal

During expansion of a gas into vaccum (P_("ext")=0), Work done is zero

1.	During expansion of a gas into vaccum (P_("ext")=0), Work done is zero if the process is (A) Reversible (B) Irreversible (C ) Isothermal
Answer» A,B & C are true A,B,&C are false A & C are true B & C are false Answer :A