Which process is/are used to remove permanent hardness ?

What do you understand by hardness of water? Describe the permutit and calgon processes used to remove the permanent hardness of water.

Which process is used to remove only temporary hardness of water.

Calcium Hydroxide cannot be used to remove permanent hardness of water why?

Write the chemical name and chemical formula of the salt used to remove permanent hardness of water.

Explain how calgon is used to remove permanent hardness.

The reagent which is not used for removing the permanent hardness of water is :

The reagent which is not used for removing the permanent hardness of water is :

Describe any two methods that may be used to remove permanent hardness of water.