The cause of permanent hardness of water is due to

1.	The cause of permanent hardness of water is due to
Answer» `Ca(HCO_(3))_(2)` `Mg(HCO_(3))_(2)` `CaCI_(2)` `MgCO_(3)` SOLUTION :Permanent HARDNESS if water is due to the presence of the CHLORIDES, nitrates and SULPHATES `Ca^(2+)` and `Mg^(2+)` ions.

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