The salt responsible for permanent hardness of `H_(2)O` is

The salt responsible for permanent hardness of water is

Permanent hardness of water can be removed only by chemical methods. Write the name of any one salt responsible for the permanent hardness of water.

Name the anions responsible for permanent hardness of water

Name the substances responsible for permanent hardness

Name the subtance which are responsible for the permanent hardness of water

Which of the following is responsible for the permanent hardness of water?

What are the causes for Permanent hardness

Permanent hardness of water is due to