Question

Permanent hardness of water is due to the presence of the chlorides and sulphates of Ca, Mg and Fe.
If this is true enter 1, if false enter 0.

Answer 1

Permanent hardness of water is due to the presence of the chlorides and sulphates of $Ca,Mg$ and $Fe$. It is also called as non-carbonate hardness (NCH).

Permanent hardness is not removed by boiling but can be removed by some chemical methods like lime- soda method, zeolite method and ion exchange methods.