Permanent hardness of water is caused by the presence of

1.	Permanent hardness of water is caused by the presence of
A.	bicarbonates of calcium and magnesium
B.	carbonates of sodium and potassium
C.	chlorides and sulfates of calcium and magnesium
D.	phosphates of sodium and potassium
Answer» D. phosphates of sodium and potassium

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Permanent hardness of water is caused by the presence of

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