The ion that is oxidized in the above redox reaction is Mg (option A). Details about oxidation can be found below.
Oxidation in a redox reaction is a reaction in which the atoms of an element lose electrons and the oxidation state of the element increases.
According to this question, the redox reaction is given as follows: Mg + Cl2 = Mg2+ + 2Cl–
As shown in the above redox reaction, Magnesium oxidation number increases from 0 to 2+, therefore, is the one being oxidized.
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