6. Which of the following is a use of alum
(a) Making explosives (b) Bleaching clothes
(c) Water softening (d) none.
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(C) Water softening
Explanation:
An alum is a type of chemical compound, usually a hydrated double sulfate salt of aluminium with the general formula XAl ₂·12H ₂O, where X is a monovalent cation such as potassium or ammonium. By itself, "alum" often refers to potassium alum, with the formula KAl ₂·12H ₂O.
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