MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic ChemistryHydrogenPrevious Year Questions
Which one of the following processes will produce hard water? (RPMT 2008)
A.Saturation of water with CaCO3
B.Saturation of water with MgCO3
C.Saturation of water with CaSO4✓ Correct
D.Addition of Na2SO4 to water
Explanation
Saturation of water with Ca and Mg salts cause hardness of water. Temporary hardness is caused by soluble Ca and Mg hydrogen carbonates. Calcium and magnesium sulphates and chlorides cause permanent hardness.
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