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Q.

Purpose of addition of alum to water during purification of water is

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a

To remove coloured impurities

b

To adsorb impurities

c

To coagulate suspended impurities

d

All of these

answer is C.

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Detailed Solution

Alums are the electrolytes which when added to water , coagulate suspended impurites
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Purpose of addition of alum to water during purification of water is