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What is bleaching powder chemically call...

What is bleaching powder chemically called ? Give a reaction for its preparation. State one of its use.

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Bleaching powder is chemically called calcium oxychloride with formula `CaOCl_(2).` It is prepared by passing chlorine over slaked lime.
`Ca(OH)_(2)+Cl_(2)toCaOCl_(2)+H_(2)O.`
Bleaching powder is used as a bleaching agent.
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