The chemical reaction, 2 AgCl_ (s) +H_ 2(~g) arrow 2 HCl_ (a q) + 2...

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1. A\mathrm{Pt}_{(s)} \mid \mathrm{H}_{2(g),}, 1$bar \left|1 \mathrm{M} \mathrm{KCl}_{(a q)}\right| \mathrm{AgCl}_{(s)} \mid \mathrm{Ag}_{(s)}$
2. B\mathrm{Pt}_{(s)} \mid \mathrm{H}_{2(\mathrm{~g})}, 1$bar \left|1 \mathrm{MHCl}_{(a q)}\right| 1 \mathrm{M} \mathrm{Ag}_{(a q)} \mid \mathrm{Ag}_{(s)}$
3. C\mathrm{Pt}_{(s)} \mid \mathrm{H}_{2(g),}, 1$bar \left|1 \mathrm{MHCl}_{(a q)}\right| \mathrm{AgCl}_{(s)} \mid \mathrm{Ag}_{(s)}$
4. D\mathrm{Pt}_{(s)} \mid \mathrm{H}_{2(g),}, 1$bar \left|1 \mathrm{MHCl}_{(a q)}\right| \mathrm{Ag}_{(s)} \mid \mathrm{AgCl}_{(s)}$