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Standard XII
Chemistry
Valence Bond Theory
Alum is used ...
Question
Alum is used in purifying water by:
A
forming silicon complex with clay particles
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B
sulphate part combines with dirt and removes it
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C
coagulating the mud particles
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D
making mud water soluble
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Solution
The correct option is
D
coagulating the mud particles
Alum contains trivalent
A
l
3
+
ion which coagulates negative sol of clay and dirt in water.
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