Bleaching powder is prepared by passing _______ gas over dry slaked lime.

hydrogen

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nitrogen

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oxygen

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chlorine

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Solution

The correct option is D chlorine
Bleaching powder $C a (O C l)_{2}$ is formed by passing chlorine gas over dry slaked lime at 400 $° C.$

$2 C a (O H)_{2} (l) + 2 C l_{2} (g) \to C a (O C l)_{2} (s) + 2 H_{2} O (l) + C a (C l)_{2} (a q)$

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Bleaching powder is obtained, when slaked lime reacts with ______.

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