$P t | O_{2} (g, 1 a t m) | O H^{-} (1 M) | | C l^{-} (1 M) | C l_{2} (g, 1 a t m) | P t$
For the given cell, the cell reaction is:

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Solution

Anode: $C l^{-} \to$ $H_{2} C l_{2}$ + $e^{-}$ (oxidation) $(X_{2})$
Cathod: $O_{2} + 2 H^{+} + 2 e^{-}$ $\to 2 O H^{-}$ (reduction) $(X_{1})$
Or $2 C l^{-} + O_{2} + 2 H^{+}$ $\to 2 O H^{-} + C l_{2}$ $↑ (g a s)$
or $2 H C l + 2 O_{2} \to 2 O H^{-} + C l_{2}$

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Pt|O2(g,1atm)|OH−(1M)||Cl−(1M)|Cl2(g,1atm)|PtFor the given cell, the cell reaction is:

Anode: Cl−→H2Cl2+e− (oxidation) (X2)Cathod:O2+2H++2e−→2OH− (reduction) (X1)Or 2Cl−+O2+2H+→2OH−+Cl2 ↑(gas)or 2HCl+2O2→2OH−+Cl2

$P t | O_{2} (g, 1 a t m) | O H^{-} (1 M) | | C l^{-} (1 M) | C l_{2} (g, 1 a t m) | P t$
For the given cell, the cell reaction is:

Anode: $C l^{-} \to$ $H_{2} C l_{2}$ + $e^{-}$ (oxidation) $(X_{2})$
Cathod: $O_{2} + 2 H^{+} + 2 e^{-}$ $\to 2 O H^{-}$ (reduction) $(X_{1})$
Or $2 C l^{-} + O_{2} + 2 H^{+}$ $\to 2 O H^{-} + C l_{2}$ $↑ (g a s)$
or $2 H C l + 2 O_{2} \to 2 O H^{-} + C l_{2}$