A) \[1\,MA{{g}^{+}},1\,MC{{o}^{2+}}\]
B) \[2M\,A{{g}^{+}},2\,MC{{o}^{2+}}\]
C) \[0.1\,M\,A{{g}^{+}},2\,MC{{o}^{2+}}\]
D) \[2\,M\,A{{g}^{+}},0.1\,MC{{o}^{2+}}\]
Correct Answer: D
Solution :
Oxidation potential of Co is more than Ag, hence cell reaction will be \[Co+2A{{g}^{+}}\xrightarrow{{}}C{{o}^{2+}}+2Ag\] \[{{E}_{cell}}=E_{cell}^{{}^\circ }-\frac{RT\,ln[C{{o}^{2+}}]}{nF{{[A{{g}^{+}}]}^{2}}}\], the lesser the value of the factor \[\frac{[C{{o}^{2+}}]}{{{[A{{g}^{+}}]}^{2}}}\] greater will be value of \[{{E}_{cell}}.\]
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