Question
The reaction : $$\frac{1}{2}H{g_2}\left( g \right) + AgC{\text{l}}\left( s \right) \to $$ $${H^ + }\left( {aq} \right) + C{l^ - }\left( {aq} \right) + Ag\left( s \right)$$ occurs in the galvanic cell
A.
$$Ag\left| {AgC{\text{l}}\left( s \right)\left| {KC{\text{l}}\left( {{\text{soln}}} \right)\left| {AgN{O_3}\left( {{\text{soln}}} \right)\left| {Ag} \right.} \right.} \right.} \right.$$
B.
$$Pt\left| {{H_2}\left( g \right)\left| {HC{\text{l}}\left( {{\text{soln}}} \right)\left| {AgN{O_3}\left( {{\text{soln}}} \right)\left| {Ag} \right.} \right.} \right.} \right.$$
C.
$$Pt\left| {{H_2}\left( g \right)\left| {HC{\text{l}}\left( {{\text{soln}}} \right)\left| {AgC{\text{l}}\left( s \right)\left| {Ag} \right.} \right.} \right.} \right.$$
D.
$$Pt\left| {{H_2}\left( g \right)\left| {KC{\text{l}}\left( {{\text{soln}}} \right)\left| {AgC{\text{l}}\left( s \right)\left| {Ag} \right.} \right.} \right.} \right.$$
Answer :
$$Pt\left| {{H_2}\left( g \right)\left| {HC{\text{l}}\left( {{\text{soln}}} \right)\left| {AgC{\text{l}}\left( s \right)\left| {Ag} \right.} \right.} \right.} \right.$$
Solution :
NOTE: Oxidation is loss of electron and in a galvanic cell it occurs at anode. Reduction is gain of electron and in a galvanic cell it occurs at cathode.
Cell representation :
Anode/ Anodic electrolyte || Cathodic electrolyte / Cathode
Reaction at Anode : $${H_2} \to 2{H^ + } + 2{e^ - }$$
Reaction at Cathode : $$AgCl + {e^ - } \to Ag + C{l^ - }$$-