Question

The substance which on treating with chlorine yields Bleaching powder is

Answer 1

it might be Calcium oxide(CaO)

Answer 2

heya friend ✋✋

here's your answer (≧▽≦)
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Bleaching powder is produced by the action of Chlorine on dry Slaked lime [Ca(OH)2]

Ca(OH)2 + Cl2 -----> CaOCl2 + H20

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hope it helps u ^_^ ^_^ ^_^