Study this chemical reaction:

Ni+2Cl2=NiCl4

Then, write balanced half-reactions describing the oxidation and reduction that happen in this reaction.

The oxidation reaction: Ni → Ni⁴⁺ + 4e.

The reduction reaction: 2Cl₂ + 4e → 4Cl⁻.

Explanation:

The mentioned reaction: Ni + 2Cl₂ → NiCl₄. It is an oxidation-reduction reaction comes from two half reactions.

The oxidation reaction: in it Ni losses 4 electrons and is oxidized to Ni⁴⁺ according to the reaction:

Ni → Ni⁴⁺ + 4e.

The reduction reaction: every molecule of Cl₂ will gain 2 electrons and is reduced to 2Cl⁻ according to the reaction:

2Cl₂ + 4e → 4Cl⁻.

The summation of the two-half reactions will give the reaction:

Ni + 2Cl₂ → NiCl₄.