Potash alum is useful in water purification because it - – McqOptions

MCQOPTIONS

1.	Potash alum is useful in water purification because it -
A.	Kills micro-organisms.
B.	It removes hardness of water.
C.	It precipitates the colloidal solution.
D.	It keeps the water soft.
Answer» D. It keeps the water soft.

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