Bleaching powder becomes useless on expo...

Bleaching powder becomes useless on exposure to air because

A

it evolves `Cl_2` by decomposition

B

it absorbs `CO_2` to form `CaCO_3`

C

it is affected by `O_2` in hair

D

None of the above

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Verified by Experts

The correct Answer is:

B

Bleaching power on exposure to air becomes useless because it absorbs `CO_2 ` to form `CaCO_3`
`CaOCl_2 + CO_2 to CaCO_3 + Cl_2 uarr`

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