The correct option for a redox couple is:

A Both are oxidised forms involving same element.

B Both are reduced forms involving same element.

C Both the reduced and oxidized forms involve same element.

D Cathode and anode together.

The answer is C.

Solution

A redox couple consists of the oxidised and reduced forms of the same element/species (e.g. $Zn^{2+}/Zn$ or $Fe^{3+}/Fe^{2+}$).

Concept Definition of a redox couple

30 questions from this chapter have appeared across 19 exam years.