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Applications of Colloids

Alum is used ...

Question

Alum is used to purify water since it acts as

A

Bactericide

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B

De-odorant

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C

Softener

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D

Coagulant

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Solution

The correct option is D
Coagulant

Al³⁺ ions in potash alum (K₂SO₄.Al(SO₄)₃.24H₂O) coagulates mud particles in water

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