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