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  1. In chemical terms, what are alums used for purifying water for drinking purposes ?
    1. Hydrated chlorides
    2. Double nitrate
    3. Double sulphates
    4. Nitrates of aluminium
Correct Option: C

Alum is double sulphates having the composition M2SO4. M2(SO4)3.24H2O.
Where M stands for monovalent basic radicals. Alums have Germicide properties and thus used in purification of water.


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