Which half-reaction correctly represents oxidation?
OA) Mg + 2e-
Mg2+
B) Mg2+ + 2e- - Mg
OC) Mg2+ - Mg + 2e-
OD) Mg - Mg2+ + 2e-

represents oxidation.

Explanation:

Oxidation-reduction reaction or redox reaction is defined as the reaction in which oxidation and reduction reactions occur simultaneously.

Oxidation reaction is defined as the reaction in which a substance looses its electrons. The oxidation state of the substance increases.

Example:

Reduction reaction is defined as the reaction in which a substance gains electrons. The oxidation state of the substance gets reduced.

Example:

represents oxidation.