Answer:
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
