Question

If the standard reduction potential of a certain half-reaction is -0.30 V, which statement below is true for this half-reaction to proceed as a reduction?

A) This half-reaction will proceed if it is coupled to another half-reaction that has a standard reduction potential greater than +0.30 V.

B) This half-reaction will proceed if it is coupled to another half-reaction that has a standard reduction potential greater than -0.30 V.

C) This half-reaction will proceed if it is coupled to another half-reaction that has a standard reduction potential less than -0.30 V.

D) It doesn't matter what half-reaction this is coupled with, it will proceed spontaneously.

Answer 1

If Standard Reduction potential is lower it will undergo oxidation reaction and if Standard Reduction potential is higher it will undergo Reduction reaction.

Simply we can justify two half coupled reaction will follow Oxidation - Reduction reaction or not.

Between two half reactions, one follows Oxidation when SRP is lower and another had reaction follows Reduction when SRP is higher.

The given half reaction SRP is -0.30 V it should proceed as Reduction

so another half reaction SRP should be lesser than -0.30 V then it will undergo Oxidation

Therefore the answer will be Option ( C )