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

(a) Hydrated chlorides

(b) Double nitrate

(c) Double sulphates

(d) Nitrates of aluminium

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(c) Double sulphates


Alum is used for all the 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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