Which of the following statements is/are correct?

Options

A. First law of thermodynamics can be seen as law of conervation of energy. So according to first law, total energy of a system always remains constant.
B. `pH` is an extensive property.
C. Third law of thermodynamics state that entropy of a chemically pure perfect crystal is zero at `0^(@)C`
D. Entropy of an isolated system always increases in an irreversible process.

Answer

D

Explanation

(A). Total energy of a ISOLATED system remains conserved.
(C). Entropy of a chemically pure perfect crystal is zero at. Zero KELVIN.
(D). This is one of the statements of second law of thermodynamics.