Bleaching powder slowly decomposes to form:

C a C l_{2} + C a (C l O_{3})_{2}

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C a O + C l_{2}

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C a C l_{2} + C a (O C l)_{2}

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C a C O_{3} + C l_{2}

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Solution

The correct option is D $C a C O_{3} + C l_{2}$
When exposed to air, bleaching powder gives a smell of chlorine. This is because bleaching powder reacts with carbon dioxide from the atmosphere to produce calcium carbonate and chlorine.
$C a (O C l)_{2} + C O_{2} \to C a C O_{3} + C l_{2}$

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