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Which one of the following is present as an active ingredient in bleaching powder for bleaching action?

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Which one of the following is present as an active ingredient in bleaching powder for bleaching action?
A. `Ca(OC l)_2`
B. `CaO_2Cl_2`
C. `CaCl_2`
D. `CaOCl_2`
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Correct Answer - A
`Ca(OC l)_2`, calcium hypochlorite is the active ingredient in bleaching powder which releases chlorine.
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