Question

Select correct statement

• A. In the decomposition of an oxide into oxygen and solid/liquid metal, entropy increases.
• B. Decomposition of an oxide is an endothermic change.
• C. To make $\Delta G^{o}$ negative, temperature should be high enough so that $T \Delta S^{o} > \Delta H^{o}$.
• D. All statements are correct

Answer 1

Answer: (D)

(a) When the oxide undergoes a phase change, there will be an increase in the entropy of the oxide.
(b) It is true statements, $HgO \xrightarrow{\Delta} Hg + I/2O_{2}$
(c) For a reduction process the change in the free energy, $\Delta G^{o}$ must be negative and to make $\Delta G^{o}$ negative temperature should be high enough so that $T \Delta S^{o} > \Delta H^{o}$