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Valency and Oxidation State

Choose the co...

Question

Choose the correct option regarding change in oxidation number of the underlined atom in the following conversion.

$C a O C l_{2} - -- - + H_{2} O \to C a (O H)_{2} + C l_{2}$

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-1

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None of these

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Solution

The correct option is A 0
In $C a O {C l}_{2}$ , $C l$ has two oxidation states: $+ 1$ and $- 1$ as shown in the figure.

$C a (O C l^{(+ 1)}) C l^{(- 1)} + H_{2} O ⟶ C a (O H)_{2} + C l^{(} 0)_{2}$
The net change in Oxidation state of $C l = (- 1) + (+ 1) = 0$
Hence, the A is the correct option.

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