The chemical reaction
`2AgCl_("(fused)")+H_(2(g))rarr2HCl_((aq))+2Ag_((s))`
taking place in a galvanic cell is represented by the notation

Options

A. `Pt|H_(2(g)),1"bar"|1M" "KCl_((aq))//AgCl_((s))|Ag_((s))`
B. `Pt_((s))|H_(2(g)),1"bar"|1M" "HCl_((aq))||1MAg_((aq))^(+)|Ag_((s))`
C. `Pt_((s))|H_(2(g)),1"bar"|1M" "HCl_((aq))|AgCl_((s))|Ag_((s))`
D. `Pt_((s))|H_(2(g)),1"bar"|1M" "HCl_((aq))|Ag_((s))|AgCl_((s))`

Answer

B

Explanation

`2AgCl_((s))+H_(2(g))to2HCl_((aq))+2Ag_((s))`
the activities of solids and liquid are takes as unity and at low concentrations, the activity of a solute is approximated to its molarity.
The cell reaction will be
`Pt_((s))|H_(2(g)),1"bar"|H_((aq))^(+)1M|AgCl_((aq))1M|Ag_((s))`.