Q.

How many grams of MgCO3 dissolved per litre gives 84 ppm hardness?

A. 70.56 mg/l
B. 48.23 mg/l
C. 81.49mg/l
D. 66.12 mg/l
Answer» A. 70.56 mg/l
Explanation: 70.56 mg/l of mgco3 dissolved per litre gives 84 ppm hardness.
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