Answer: [tex]Mg\rightarrow Mg^{2+}+2e^-[/tex] 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: [tex]Mg\rightarrow Mg^{2+}+2e^-[/tex]
Reduction reaction is defined as the reaction in which a substance gains electrons. The oxidation state of the substance gets reduced.
Example: [tex]Mg^{2+}+2e^-\rightarrow Mg[/tex]
[tex]Mg\rightarrow Mg^{2+}+2e^-[/tex] represents oxidation.
Based on the given half reactions, the half reaction that represents oxidation is Mg ----> Mg2+ + 2e
Oxidation is a type reaction in which electrons are given out or lost by an element.
During oxidation, the oxidation number of the element increases.
Substances which give out electrons are known as oxidizing agents.
Metals are good oxidizing agents as they easily give out electrons.
From the given half reactions, the oxidation reaction is one in which the oxidation number of Mg increases from 0 to +2.
Therefore, the half reaction that represents oxidation is Mg ----> Mg2+ + 2e
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