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  • The one that is NOT suitable for the removal of permenent hardness of water :-Option: 1 Clark’s methodOption: 2 Clark’s methodOption: 3 Clark’s methodOption: 4 Clark’s methodO

The one that is NOT suitable for the removal of permenent hardness of water :-
Option: 1 Clark’s method
Option: 2 Clark’s method
Option: 3 Clark’s method
Option: 4 Clark’s method
Option: 5 Ion-exchange method
Option: 6 Ion-exchange method
Option: 7 Ion-exchange method
Option: 8 Ion-exchange method
Option: 9 Calgon's method
Option: 10 Calgon's method
Option: 11 Calgon's method
Option: 12 Calgon's method
Option: 13  Treatment with sodium carbonate.
Option: 14  Treatment with sodium carbonate.
Option: 15  Treatment with sodium carbonate.
Option: 16  Treatment with sodium carbonate.

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