Bleaching powder is prepared by passing A. chlorine over slaked lime B. oxygen over slaked lime C. carbon dioxide over slaked lime D. chlorine over quicklime

The correct answer is D. Bleaching powder is prepared by passing chlorine over quicklime.

Quicklime is calcium oxide, which is produced by heating limestone (calcium carbonate) to a high temperature. When chlorine is passed over quicklime, it reacts to form calcium hypochlorite, which is the active ingredient in bleaching powder.

The other options are incorrect because they do not produce calcium hypochlorite. Option A, passing oxygen over slaked lime, would produce calcium oxide and water. Option B, passing

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