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In chemical terms what are alums used for purifying water for...

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

Answer & Solution
Correct Answer: 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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