Question

Permanent hardness of water can be removed by
adding Calgon (NaPO₃)n. This is an example of
(a) Adsorption (b) Exchange of ion
(c) Precipitation (d) None

Answer 1

Answer:

Heyaa✌️✌️

Your right answer is :- b) Exchange if ion.

Hope it helped you.

Answer 2

Answer:

Exchange of ion

Explanation:

hardness of water is removed by the process by adding calgon this is an example of exchange of ion.