The one that is NOT suitable for the removal of permanent hardness of water is :

Question:

The one that is NOT suitable for the removal of permanent hardness of water is :

 

  1. Treatment with sodium carbonate

  2. Calgon's method

  3. Clark's method

  4. Ion-exchange method


Correct Option: , 3

Solution:

Temporary hardness of water is removed by clark method and boiling. While permanent hardness of water is removed by treatment with sodium carbonate $\left(\mathrm{Na}_{2} \mathrm{CO}_{3}\right)$, calgons method and ion-exchange method

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