Answer :

According to convention, an electrochemical reaction can be represented as Reaction at anode || Reaction at cathode. The || represents the salt bridge. The reaction in question shows the anodic reaction of Mg which gets oxidized to Mg2+ and the cathodic reaction is Cu2+ which gets reduced to Cu and is deposited on the cathode. The combined half-cell reactions can be represented as

Mg Mg2+ + 2e- at anode and Cu2+ + 2e- Cu(s) at cathode. Combined, it forms Mg + Cu2+ Mg2+ + Cu.

Hence, the correct options are (ii) and (iii).

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