MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic ChemistryHydrogenPrevious Year Questions

Hardness of water is due to the presence of salts of (AMU 2007)

A.Na+ and K+

B.Ca2+ and Mg2+✓ Correct

C.Ca2+ and K+

D.Ca2+ and Na+

Explanation

Hardness of water is due to the presence of salts of calcium and magnesium. The hardness of water can be classified as temporary and permanent hardness based on the composition of salts present in the water. HYDROGEN 22 Type of hardness Salts present Permanent hardness Calcium sulphate 4 CaSO Calcium chloride 2 CaCl Magnesium sulphate 4 MgSO Magnesium chloride 2 MgCl Temporary hardness Calcium bicarbonate 3 2 Ca HCO Magnesium bicarbonate 3 2 Mg HCO

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