Question

Identify the correct statement regarding a spontaneous process
(a) Lowering of energy in the process is the only criterion for spontaneity.
(b) For a spontaneous process in an isolated system, the change in entropy is positive.
(c) Endothermic processes are never spontaneous.
(d) Exothermic processes are always spontaneous.

Answer 1

(b) For a spontaneous process in an isolated system, the change in entropy is positive.