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  1. In chemical terms, what are alums used for purifying water for drinking purposes ?

    2. A.

     Hydrated chlorides
    B.

     Double nitrate
    C.

     Double sulphates
    D.

     Nitrates of aluminium

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    Answer : Option C

    Explanation :

    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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