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Bleaching powder slowly loses its activity when it stand in air. This is due to

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Bleaching powder slowly loses its activity when it stand in air. This is due to
A. Reaction with `CO_(2)` to evolve `Cl_(2)`
B. Reaction with moisture to liberate `O_(2)`
C. Loss of `CaCl_(2)`
D. Formation of `Ca(OH)_(2)`
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Correct Answer - A
`CaOCl_(2) + CO_(2) rarr CaCO_(3) + Cl_(2)` because `Cl_(2)` is lost.
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