Question

Which statement about standard reduction potentials is correct?

• A. $E_{ H ^{+} / H _{2}}^{\circ}>0$
• B. $E_{ D ^{+} / D _{2}}^{\circ}<0$
• C. A redox reaction is feasible if sum of SRP of oxidant and that of reductant is a positive quantity.
• D. $K _{2} Cr _{2} O _{7}$ is stronger oxidising agent than $KMnO _{4}$ in acidic medium.

Answer 1

Answer: (C)

For a spontaneous reaction, $\Delta G=- ve$

which is possible if $E^{\circ}$ is +ve because, $\Delta G=-n F E^{\circ}$