Q. Agalvanic cell is constructed using the redox reaction, $\frac{1}{2}H_{2}\ (g) + \ AgCl(s) \rightleftharpoons \ H^{+}\ (aq) + \ {Cl}^{-}\ (aq) + \ Ag\ (s)$ It is represented as
A) $Pt\ |\ H_{2}(g)\ |\ HCl\ solution\ ||\ {AgNO}_{3}\ solution\ |\$
$Ag$
B) $Ag\ \left| \ AgCl(s) \right|KCl\ solution\ ||HCl\ solution\ ,\$
$|\ H_{2}(g)\ |\ Pt$
C) $Pt\ |\ H_{2}(g)\ |\ KCl\ solution\ ||\ AgCl(s)\ |\ Ag$
D) $Pt\ |\ H_{2}(g)\ ,\ HCl\ solution\ ||\ AgCl(s)\ |\ Ag$
Explanation
(d)
The cell reaction is,
$\frac{1}{2}\ H_{2}(g)$ + AgCl(s)$\longrightarrow \ H^{+}(aq) + \ {Cl}^{-}(aq) + \ Ag\ (s)$
Obviously, here hydrogen is being oxidized and AgCl is getting reduced. Hence, the correct cell representation will be
Pt | $H_{2}(g)$ , HCl solution || AgCl(s) | $Ag$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.