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Q.

Bleaching powder gives smell of chlorine because it


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a

Gives chlorine on exposure to atmosphere

b

Contains excess of chlorine 

c

Is unstable

d

Is a mixture of chlorine and slaked lime

answer is B.

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Detailed Solution

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Bleaching powder gives smell of chlorine because it gives chlorine on exposure to atmosphere.
It has the chemical formula CaOCl2. When it is reacted with carbon dioxide in the atmosphere, it forms chlorine gas and calcium carbonate. It is also known as chloride of lime. Bleaching powder is used in laundry and textile industry.
CaOCl2+Cl2CaCO3+Cl2
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Bleaching powder gives smell of chlorine because it