Chemistry - Thermodynamics - II Question with Solution | TestHub

$\Delta H^{\circ }-\Delta U^{\circ }=\Delta n_{g}RT$

since $\Delta n_g<0$

$\Rightarrow \Delta {\mathrm{H}}^{\circ }-\Delta {\mathrm{U}}^{\circ }\le 0$

$\Delta H^{\circ }<0$

$\Delta S^{\circ }<0;C_p=\frac{3}{2}R+R;=\frac{5}{2}R;\Delta r{C}_p<0]$

Option D: In a $\mathrm{CO},{\mathrm{O}}_2$ fuel cell electrical energy obtained by cell $>|\Delta H_{combustion}^{\circ }\mathrm{CO}(\mathrm{g})|$

In a fuel cell, the maximum electrical work obtainable is given by the Gibbs free energy change ($\Delta G$). The efficiency of a fuel cell is given by $\frac{\Delta G}{\Delta H}$. Since the efficiency is always less than 1, $|\Delta G|<|\Delta H|$.