At 25$$^\circ$$C and 1 atm pressure, the enthalpies of combustion are as given below :

Substance	$${H_2}$$	C (graphite)	$${C_2}{H_6}(g)$$
$${{{\Delta _c}{H^\Theta }} \over {kJ\,mo{l^{ - 1}}}}$$	$$ - 286.0$$	$$ - 394.0$$	$$ - 1560.0$$

The enthalpy of formation of ethane is

The incorrect expression among the following is :

During which of the following processes, does entropy decrease?

(A) Freezing of water to ice at 0$$^\circ$$C

(B) Freezing of water to ice at $$-$$10$$^\circ$$C

(C) N₂(g) + 3H₂(g) $$ \to $$ 2NH₃(g)

(D) Adsorption of CO(g) on lead surface.

(E) Dissolution of NaCl in water

Choose the correct answer from the options given below :

For a reaction,
4M(s) + nO₂(g) $$ \to $$ 2M₂O_n(s)
the free energy change is plotted as a function of temperature. The temperature below which the oxide is stable could be inferred from the plot as the point at which :