Chemistry - Chemical Equilibrium Question with Solution | TestHub

A closed system at constant T and P reaches the state of lowest Gibbs energy, so (b) is correct At that minimum the slope of G against the extent of reaction is zero, that is Δ G = 0, so (a) is correct

Δ G^° = -RTln K is zero only when K = 1, which is not true for every reaction, so (c) is wrong

The criterion is on G, and the entropy of the system alone need not be maximum, so (d) is wrong

The correct statements are (a) and (b).