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Bleaching powder is obtained by the interaction of \( C l_{2} \) with:

1. dilute solution of \( C a(O H)_{2} \)
2. concentrated solution of \( C a(O H)_{2} \)
3. dry Cao
4. dry slaked lime

Correct answer: dilute solution of \( C a(O H)_{2} \)

Solution

Bleaching powder (calcium oxychloride) is produced when chlorine reacts with dilute/slaked lime, where moisture allows the reaction to proceed. Dry CaO or concentrated calcium hydroxide are not the standard conditions for its preparation.

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