Hardness of water may be temporary or permanent. Permanent hardness is

1.	Hardness of water may be temporary or permanent. Permanent hardness is due to the presence of
Answer» chlorides of Ca and Mg in WATER sulphates of Ca and Mg in water hydrogen carbonates of Ca and Mg in water carbonates of alkali METALS in water Solution :Permanent HARDNESS of water is due to chlorides and sulphates of `ca^2` and `Mg^(2+)` and its not removed by heating.

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