The correct answer is: A. Chlorine over slaked lime
Bleaching powder is a chemical compound with the formula CaOCl2. It is a white, odorless powder that is used as a bleaching agent, disinfectant, and deodorizer. It is also used in the production of paper, textiles, and other products.
Bleaching powder is prepared by passing chlorine gas over slaked lime (calcium hydroxide). The reaction is as follows:
$$2\text{Ca(OH)}_2 + 2\text{Cl}_2 \to \text{CaCl}_2 + \text{CaOCl}_2 + 2\text{H}_2\text{O}$$
The calcium chloride and calcium hypochlorite produced in this reaction are then separated by filtration. The calcium chloride is a waste product, while the calcium hypochlorite is the bleaching powder.
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