Question

Addition of alum purifies water give reason 2

Answer 1

hlo friend

the answer to ur question is

=Alum, when added to raw water reacts with the bicarbonate alkalinities present in water and forms a gelatinous precipitate. This floc attracts other fine particles and suspended material in raw water, and settles down at the bottom of the container.

=the alum may contain positive and negative ions that purifies water

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