All spontaneous processes are

All spontaneous processes are

a. reversible
b. irreversible
c. quasi-static
d. none of the above

Correct Answer : b. irreversible

Explanation :

A reversible process is carried out infinitely slowly, so that every state passed through by the system is an equilibrium state. In the spontaneous process every state will not be an equilibrium state as the spontaneous process is carried out very fast. Only the first and the last state of the spontaneous process are the equilibrium states. Therefore the spontaneous process will not be a reversible or quasi-static process. It is an irreversible process.