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The standard ...

Question

The standard reduction potentials $E^{\circ}$ for $O C l^{-} / C l^{-}$ and for $C l^{-} / 1 / 2 C l_{2}$ are $0.86 V$ and $- 1.10$ volt respectively. The $E^{\circ}$ value of $O C l^{-} / 1 / 2 C l_{1}$ will be ?

A

+ 1.96 V

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B

- 1.96 V

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C

+ 0.24 V

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D

- 0.24 V

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Solution

The correct option is D $- 0.24 V$
$O C l^{-} + H_{2} O + e^{-} \to C l^{-} + 2 O H^{-} E_{r e d}^{\circ} = 0.86 V$
$C l^{-} \to \frac{1}{2} C l_{2} + e^{-} - ------------------ - E_{o x i .}^{\circ} = - 1.10 V$
$O C l^{-} + H_{2} O \to \frac{1}{2} C l_{2} + 2 O H^{-} - -------------------------------- - E^{\circ} = 0.86 + (- 1.10)$
$= - 0.24 V$ .

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