A) \[Hg+C{{u}^{2+}}\to H{{g}^{2+}}+Cu\]
B) \[Hg+C{{u}^{2+}}\to C{{u}^{+}}+H{{g}^{+}}\]
C) \[Cu+Hg\to CuHg\]
D) \[Cu+H{{g}^{2+}}\to C{{u}^{2+}}+Hg\]
Correct Answer: D
Solution :
Galvanic cell is \[Cu(s)/C{{u}^{2+}}(aq)||\,H{{g}^{2+}}(aq)|Hg\] In the above cell oxidation of copper and reduction of mercury takes place. Its cell reaction is written as: \[Cs(s)+H{{g}^{2+}}(aq)\xrightarrow{{}}C{{u}^{2+}}(aq)+Hg\]
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