Bleaching powder loses its power on keeping for long time because :

it changes to calcium hypochlorite.

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it changes to calcium chloride and calcium hydroxide.

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it absorbs moisture.

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it changes to calcium carbonate and chlorine.

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Solution

The correct option is D it changes to calcium carbonate and chlorine.
Bleaching powder reacts with carbon dioxide in air to give chlorine and calcium carbonate.
$2 C a (C l O)_{2} + 2 C O_{2} \to 2 C a C O_{3} + 2 C l_{2} + O_{2}$

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