Question

Which of the following is/are reduction reaction?

• A. Hg²⁺ + 2^e- → Zn
• B. Zn²⁺ + 2^e- → Zn
• C. Fe²⁺ → Fe³⁺ + e^-
• D. MnO₄^2- → MnO₄^- + e^-

Answer 1

The correct option is A

Hg²⁺ + 2^e- → Zn

Gain of electrons indicates the occurence of reduction reaction.
${Hg}^{2+}$ + ${2e}^{-}$ $⟶$ $Hg$ is the only reduction reaction

The other options are oxidation reactions due to loss of electrons.