Bleaching powder is obtained by treating $C l_{2}$ with :

C a (O H)_{2}

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C a O

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C a C O_{3}

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C a C l_{2}

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Solution

The correct option is A $C a (O H)_{2}$
Bleaching powder is manufactured by the action of chlorine on dry slaked lime, $C a (O H)_{2}$ at $40^{0} C$ tempareature.
$2 C l_{2} + 2 C a (O H)_{2} \to C a (O C l)_{2} + C a C l_{2} + 2 H_{2} O$ .
Hence option A is correct.

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