1.

The method used to remove temporary hardness of water is :(1)  Calgon's method(2)  Clark's method(3)  Ion-exchange method(4)  Synthetic resins method

Answer»

Correct option  (2)  Clark's method

Explanation:

Clark's method is used to remove temporary hardness of water, in which bicarbonates of calcium and magnesium are reacted with slaked lime Ca(OH)2

Ca(HCO3)2 + Ca(OH)2  2CaCO3 + 2H2

Mg(HCO3)2 + 2Ca(OH)2  2CaCO3  + Mg(OH)2  + 2H2O



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