Hydrogen and its compoundHard

Question

Which one of the following processes will produce hard water?

Options

A.Saturation of water with MgCO3
B.Saturation of water with CaSO4
C.Addition of Na2SO4 to water
D.Saturation of water with CaCO3

Solution

Permanent hardness of water is due to chlorides and sulphates of calciumand magnesium.

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