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