Which equation represents the oxidation half-reaction for this redox reaction?

Mg + CuSO4 → MgSO4 + Cu

A.

Mg → Mg

B.

Mg → Mg + O4

C.

Mg → Mg + 2e-

D.

Mg → Mg + 3e-

C. Mg → Mg²⁺ + 2e-

Explanation:

The oxidation reduction reactions are called redox reaction. These reactions are take place by gaining or losing the electrons and oxidation state of elements are changed.

Oxidation:

Oxidation involve the removal of electrons and oxidation state of atom of an element is increased.

Reduction:

Reduction involve the gain of electron and oxidation number is decreased.

Consider the following reactions.

Mg + CuSO₄ → MgSO₄ + Cu

Mg atom lose two electron and gets oxidized.

Mg → Mg²⁺ + 2e-

These two electrons are accepted by Cu and gets reduced.

CuSO₄ → Cu²⁺ + SO₄²⁻

Cu²⁺ + 2e⁻ → Cu