Q. 27

For the given cell, Mg|Mg2+|| Cu2+|Cu
A. Mg is cathode

B. Cu is cathode

C. The cell reaction is Mg + Cu2+ Mg2+ + Cu

D. Cu is the oxidising agent

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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