The alum used for purifying water is [EAMCET 1999]

1.	The alum used for purifying water is [EAMCET 1999]
A.	Ferric alum
B.	Chrome alum
C.	Potash alum
D.	Ammonium alum
Answer» D. Ammonium alum

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The alum used for purifying water is [EAMCET 1999]

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