Consider the chemical reaction below. which half reaction correctly represents reduction for this equation?

Answer is: reduction half reaction: 2H⁺ (aq) + 2e⁻ → H₂ (g).

Missing chemical reaction: Zn (s) + 2H⁺ (aq) → Zn²⁺ (aq) + H₂ (g).

Reduction is lowering oxidation number because element gain electrons.

In this chemical reaction hydrogen is reduced from oxidation number + 1 (H⁺) to neutral charge or oxidation number 0 (H₂).