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Reported Question / Answer
Q.) Permanent hardness of water is caused by the presence of
1)
carbonates of sodium and potassium
2)
bicarbonates of calcium and magnesium
3)
phosphates of sodium and potassium
4)
chlorides and sulfates of calcium and magnesium
5)
NULL
Answer :
4
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Human Verification : Answer 2 + 3 = ?
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