The reaction; \(\frac{1}{2} \mathrm{H}_{2(\mathrm{~g})}+\mathrm{AgCl}_{(\mathrm{s})} \rightarrow…

The reaction; \(\frac{1}{2} \mathrm{H}_{2(\mathrm{~g})}+\mathrm{AgCl}_{(\mathrm{s})} \rightarrow \mathrm{H}_{(\mathrm{aq})}^{+}+\mathrm{Cl}_{(\mathrm{aq})}^{-}+\mathrm{Ag}_{(\mathrm{s})}\) occurs in which of the following galvanic cell :
  1. $\mathrm{Ag}\left|\mathrm{AgCl}_{\text{s}}\right| \mathrm{KCl}_{\text{soln.}}\left|\mathrm{AgNO}_{3_{\text{aq.}}}\right| \mathrm{Ag}$
  2. $\mathrm{Pt}\left|\mathrm{H}_{2(\mathrm{g})}\right| \mathrm{HCl}_{\text {(soln.) }}\left|\mathrm{AgCl}_{(\mathrm{s})}\right| \mathrm{Ag}$
  3. $\mathrm{Pt}\left|\mathrm{H}_{2(\mathrm{g})}\right| \mathrm{KCl}_{(\text {soln. })}\left|\mathrm{AgCl}_{(s)}\right| \mathrm{Ag}$
  4. $\mathrm{Pt}\left|\mathrm{H}_{2(\mathrm{g})}\right| \mathrm{HCl}_{\text {(soln.) }}\left|\mathrm{AgNO}_{3(\mathrm{aq})}\right| \mathrm{Ag}$

Solution

Anodic half cell $\underline{\text { Gas - gas ion electrode }}$ $\frac{1}{2} \mathrm{H}_{2(\mathrm{~g})} \rightarrow \mathrm{H}_{(\mathrm{aq})}^{+}+\mathrm{e}^{-}$ Cathodic Reaction Metal-metal insoluble salt anion electrode $\mathrm{Ag}_{(\mathrm{aq})}^{+}+\mathrm{e}^{-} \rightarrow \mathrm{Ag}_{(\mathrm{s})}$ $\begin{aligned} & \mathrm{AgCl}_{(\mathrm{s})} \rightleftharpoons \mathrm{Ag}_{(\mathrm{aq})}^{+}+\mathrm{Cl}_{(\mathrm{aq})}^{-} \\ & \mathrm{AgCl}_{(\mathrm{s})}+\mathrm{e}^{-} \rightarrow \mathrm{Ag}_{(\mathrm{s})}+\mathrm{Cl}_{(\mathrm{aq})}^{-}\end{aligned}$ Overall redox reaction $\frac{1}{2} \mathrm{H}_{2(\mathrm{~g})}+\mathrm{AgCl}_{(\mathrm{s})} \rightarrow \mathrm{H}_{(\mathrm{aq})}^{+}+\mathrm{Cl}_{(\mathrm{aq})}^{-}+\mathrm{Ag}_{(\mathrm{s})}$ Cell Representation Pt $\left|\mathrm{H}_{2(\mathrm{~g})}\right| \mathrm{kCl}_{\text {(sol) }}\left|\mathrm{AgCl}_{\text {(s) }}\right| \mathrm{Ag}$

Asked in: JEE Main 2024 (08 Apr Shift 2)

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