Question

The cell reaction of the galvanic cell :$Cu (r)|Cu^2+(aq) ||Hg^{2+}(aq) Hg | (l)$ is

• A. $Hg + Cu_{2+} \rightarrow Hg_2+ + Cu$
• B. $Hg + Cu_2+\rightarrow Cu^+ + Hg^+$
• C. $Cu + Hg\rightarrow CuHg$
• D. $Cu + Hg^{2+}\rightarrow Cu^{2+} + Hg.$

Answer 1

Answer: (D)

$Cu \rightarrow Cu^{2+} + 2e^{-} $
$\frac{ Hg^{2+} +2e^{-} \to Hg}{Cu + Hg^{2+}\to Cu^{2+} + Hg}$