1.

Depict the galvanic cell in which the reaction : Zn (s) + 2Ag^+ (aq)toZn^(2+) (aq) + 2Ag (s) takes place. Further, show :(i) Which of the electrodes is negatively charged ? (ii) The carriers of the current in the cell. (iii) Individual reaction at each electrode.

Answer»

Solution :The cell may be depicted as:
`Zn (s) | Zn^(2+) (AQ) || Ag^+ (aq) | Ag (s)`
(i) ANODE i.e., zinc ELECTRODE is negatively CHARGED.
(ii) The current is carried by the ions inside the cell and by electrons outside the cell.
(iii) At Anode: `Zn (s) toZn^(2+) (aq) + 2e^(-)`
At cathode : `Ag^(+) (aq) +e^(-) to Ag (s) `


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