Question

Which of the following is/are oxidation reactions?

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

Answer 1

Answer: (C), (D)

The correct options are
C

Fe²⁺ → Fe³⁺ + e^-

D

MnO₄^2- → MnO₄^- + e^-

Oxidation is a process in which an atom or a group of atoms taking part in a chemical reaction loses one or more electrons. For example:

$Mg⟶$ ${Mg}^{2+}$ + $2e^{-}$

In option (c) and (d), there is loss of electrons making it oxidation reaction where as option (a) and (b) clearly shows addition of electrons making it reduction reaction.