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Question: Answered & Verified by Expert
A galvanic cell is constructed using the redox reaction,
$\frac{1}{2} \mathrm{H}_{2}(g)+\operatorname{AgCl}(s) \rightleftharpoons \mathrm{H}^{+}(a q)+\mathrm{Cl}^{-}(a q)+\operatorname{Ag}(s)$
it is represented as
ChemistryElectrochemistryCOMEDKCOMEDK 2013
Options:
  • A $\mathrm{Pt}\left|\mathrm{H}_{2}(g)\right| \mathrm{HCl}(\mathrm{sol})|| \mathrm{AgNO}_{3}(\mathrm{sol}) \mid \mathrm{Ag}$
  • B $\operatorname{Ag}|\operatorname{AgCl}(s)| \mathrm{KCl}(\mathrm{sol})|| \mathrm{HCl}(\mathrm{sol}), \mathrm{H}_{2}(\mathrm{~g}) \mid \mathrm{Pt}$
  • C $\mathrm{Pt}\left|\mathrm{H}_{2}(g)\right| \mathrm{KCl}(\operatorname{sol}) \| \operatorname{AgCl}(s) \mid \mathrm{Ag}$
  • D $\mathrm{Pt}\left|\mathrm{H}_{2}(g), \mathrm{HCl}(\operatorname{sol})\right||\operatorname{AgCl}(s)| \mathrm{Ag}$
Solution:
2207 Upvotes Verified Answer
The correct answer is: $\mathrm{Pt}\left|\mathrm{H}_{2}(g), \mathrm{HCl}(\operatorname{sol})\right||\operatorname{AgCl}(s)| \mathrm{Ag}$
At anode, oxidation occurs of $\mathrm{H}_{2}$ (gas), while at cathode reduction of $\mathrm{AgCl}$ take place.
$\therefore$ The cell notation is
$\mathrm{Pt}\left|\mathrm{H}_{2}(\mathrm{~g}), \mathrm{HCl}(\mathrm{sol}) \| \mathrm{AgCl}(s)\right| \mathrm{Ag}$

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