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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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