A) \[Ag,\,\,Hg,\,\,Cu,\,\,Mg\]
B) \[Mg,\,\,Cu,\,\,Hg,\,\,Ag\]
C) \[Ag,\,\,Hg,\,\,Cu\]
D) \[Cu,\,\,Hg,\,\,Ag\]
Correct Answer: C
Solution :
A cation having highest reduction potential will be reduced first and so on. However, \[M{{g}^{2+}}\] in aqueous solution will not be reduced \[\left( E_{M{{g}^{2+}}/Mg}^{0}<E_{{{H}_{2}}O/\frac{1}{2}{{H}_{2}}+O{{H}^{-}}}^{{}} \right)\]. Instead water would be reduced in preference.
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