Question

Match the thermodynamic processes given under Column I with the expressions under Column II.

Answer 1

(A) During freezing of water at 273 K and 1 atm, the entropy change of system is negative, $\Delta S_{sys}<0$ and the free energy change is zero $\Delta G=0$.

(B) During expansion of 1 mol of an ideal gas into a vacuum under isolated conditions, no heat is exchanged, $q=0$ and no work is exchanged $w=0$. There is no change in the internal energy $\Delta U=0$

(C) During mixing of equal volumes of two ideal gases at constant temperature and pressure in an isolated container, no heat is exchanged, $q=0$ and no work is exchanged $w=0$. There is no change in the internal energy $\Delta U=0$

(D) During reversible heating of $H_2$ (g) at 1 atm from 300 K to 600 K, followed by reversible cooling to 300 K at 1 atm, no heat is exchanged, $q=0$ and no work is exchanged $w=0$. There is no change in the internal energy $\Delta U=0$. The free energy change is zero $\Delta G=0$.