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Question

When bleaching powder is dissolved in water, the residue left is :

A
CaCl2
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B
Ca(ClO3)
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C
CaO
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D
Ca(OH)2
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Solution

The correct option is D Ca(OH)2
CaOCl2+H2OCa(OH)2+Cl2

Cl2 gas is evolved and Ca(OH)2 is left as a residue.

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