Write chemical name of bleaching powder. Which gas is released when it is exposed to air? Write chemical reaction involved in preparation of bleaching powder.

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Solution

Chemical name of Bleaching powder is Calcium hypochlorite.
If it is exposed to air it reacts with the carbon dioxide in the air to produce chlorine gas.
The chemical reaction is,
$C a (O H)_{2} + C l_{2} \to C a O C l_{2} + H_{2} O$

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