At equilibrium, the total entropy change is zero.
a.The statement is True
b.The statement is False
c.At equilibrium, the entropy change is not zero.
d.Option B and C
For a reversible process, entropy behaves as a conserved quantity and no change occurs in total entropy. More specifically, total entropy is conserved in a reversible process and not conserved in an irreversible process.
At equilibrium as the system will be reversible so the total change in entropy will be zero.