Q. The cell reaction of the galvanic cell $Cu\ (s)\ |\ {Cu}^{2 +}\ (aq)\ ||\ {Hg}^{2 +}\ (aq)\ |\ Hg\ (l)$ is
A) $Hg\ + \ {Cu}^{2 +}\ \longrightarrow \ {Hg}^{2 +}\ + \ Cu$
B) $Hg\ + \ {Cu}^{2 +}\ \longrightarrow \ {Cu}^{+}\ + \ {Hg}^{+}$
C) $Cu\ + \ Hg\ \rightarrow \ CuHg$
D) $Cu\ + \ {Hg}^{2 +}\ \longrightarrow \ \ {Cu}^{2 +}\ + \ Hg$
Explanation
(d)
Galvanic cell is
$Cu\ (s)\ |\ {Cu}^{2 +}\ (aq)\ ||\ {Hg}^{2 +}\ (aq)\ |\ Hg\ (l)$
In the above cell, oxidation of copper and reduction of mercury takes place. Its cell reaction is written as
$Cu\ (s)\ + \ {Hg}^{2 +}\ (aq)\ \rightarrow \ {Cu}^{2 +}\ (aq)\ + \ Hg\ (l)$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.