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An example of double salt is

1. Bleaching powder
2. K4[Fe(CN)6]
3. Hypo
4. Potash alum

Correct answer: Potash alum

Solution

Double salts are compounds that dissociate into their constituent ions when dissolved in water. Potash alum (KAl(SO4)2·12H2O) is a double salt as it dissociates into K+, Al3+, and SO4^2- ions in solution.

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