Which of the following reactions is correct for a given electrochemical cell at $25^{o} C$ ?
$P t | {B r}_{2} (g) | {B r}^{-} (a q) | | {C l}^{-} (a q) | {C l}_{2} (g) | P t$

2 {B r}^{-} (a q) + {C l}_{2} (g) \to 2 {C l}^{-} (a q) + {B r}_{2} (g)

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{B r}_{2} (g) + 2 {C l}^{-} (a q) \to 2 {B r}^{-} (a q) + {C l}_{2} (g)

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{B r}_{2} (g) + {C l}_{2} (g) \to 2 {B r}^{-} (a q) + 2 {C l}^{-} (a q)

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2 {B r}^{-} (a q) + 2 {C l}^{-} (a q) \to {B r}_{2} (g) + {C l}_{2} (g)

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Solution

The correct option is D $2 {B r}^{-} (a q) + 2 {C l}^{-} (a q) \to {B r}_{2} (g) + {C l}_{2} (g)$
For the given electrochemical cell at $25^{o} C$
$P t | {B r}_{2} (g) | ∣ ∣ {B r}^{-} (a q) ∣ ∣ ∣ ∣ {C l}^{-} (a q) ∣ ∣ | {C l}_{2} (g) | P t$
The correct reaction is
$2 {B r}^{-} (a q) + {C l}_{2} (g) ⟶ 2 {C l}^{-} (a q) + {B r}_{2} (g)$

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2 F e_{a q}^{2 +} + C l_{2 (g)} \to 2 F e_{(a q)}^{3 +} + 2 C l_{(a q)}^{-}

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