The reaction ; 1/2 H2(g) + AgCl(s) → H^+ (aq) + Cl^- (aq) + Ag(s) occurs in which of the following galvanic cell :

Question

The reaction ;

\(\frac {1}{2}H_{2(g)}+ Ag Cl _{(s)} \rightarrow H ^+ _{aq} + Cl ^- _{(aq) }+ Ag _{(s)}\)

occurs in which of the following galvanic cell :

(1) \(pt |H_{2(g)}| HCl _{(soin.)}|AgCl_{(s)}|Ag\)

(2) \(Pt |H_{2(g)}|HCl _ {(soln.)}| AgNO_{3(aq)}|Ag\)

(3) \(Pt |H_{2(g)}|KCl _{(soln.)}| AgCl _{(s)}| Ag\)

(4) \(Ag|AgCl_{(s)}|KCl_{(soln.)}| AgNO_{3(aq.)}| Ag\)

Answer 1

 Correct option is (3) \(Pt |H_{2(g)}|KCl _{(soln.)}| AgCl _{(s)}| Ag\)

Anodic half cell

Gas – gas ion electrode

\(\frac {1}{2} H_{2(g)} \rightarrow H ^+ _{(aq)} + e^-\)

Cathodic Reaction

Metal-metal insoluble salt anion electrode

\(\begin{equation} \frac{ \begin{array} Ag^+_{(aq)}+e^- \rightarrow Ag _{(s)}\\ AgCl_{(s)}\rightleftharpoons Ag^+ _{(aq)} +Cl^- _{(aq)} \end{array} }{ AgCl_{(s)} + e^- \rightarrow Ag_{(s)}+Cl^-_{(aq)} } \end{equation}\)

Overall redox reaction

\(\frac {1}{2} H_{2(g)} + Ag Cl_{(s)} \rightarrow H ^+ _ {(aq)} + Cl^- _{(aq)} + Ag _ {(s)}\)

Cell Representation

\(Pt | H_{2(g)}| KCl _ {(sol)}| Ag Cl _ {(s)}| Ag\)