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Bleaching powder is obtained by the action of chlorine gas and

1. (a) Dilute solution of Ca(OH)₂
2. (b) Concentrated solution of Ca(OH)₂
3. (c) Dry CaO
4. (d) Dry slaked lime

Correct answer: (b) Concentrated solution of Ca(OH)₂

Solution

Bleaching powder is prepared by the reaction of chlorine gas with a concentrated solution of slaked lime (Ca(OH)₂), forming Ca(OCl)₂.

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