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NCERT Class XII Chemistry
Chapter - Electrochemistry
Questions with Solutions

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Question : 3 of 32
Marks: +1, -0
Depict the galvanic cell in which the reaction :Zn(s)+2 Ag(aq)+→Zn(aq)2++2 Ag(s)\mathrm{Zn}_{(s)} + 2\,\mathrm{Ag}_{(aq)}^{+} \rightarrow \mathrm{Zn}_{(aq)}^{2+} + 2\,\mathrm{Ag}_{(s)} takes place.
Further show:
(i) Which of the electrode is negatively charged?
(ii)The carriers of the current in the cell.
(iii) Individual reaction at each electrode.
Solution:  
The cell will be represented as
Zn(s)∣Zn(aq)2+∥Ag(aq)+∣Ag(s)\mathrm{Zn}_{(s)} \mid \mathrm{Zn}_{(aq)}^{2+} \parallel \mathrm{Ag}_{(aq)}^{+} \mid \mathrm{Ag}_{(s)}
(i) Anode, i.e., zinc electrode will be negatively charged.
(ii) Electrons are current carriers. The current will flow from silver to zinc in the external circuit.
(iii) At anode : Zn(s)→Zn(aq)2++2 e−\mathrm{Zn}_{(s)} \rightarrow \mathrm{Zn}_{(aq)}^{2+} + 2\,\mathrm{e}^{-}
At cathode : Ag(aq)++e−→Ag(s)\mathrm{Ag}_{(aq)}^{+} + \mathrm{e}^{-} \rightarrow \mathrm{Ag}_{(s)}
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