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20/09/2020 10:41 am
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The one that is not suitable for the removal of permanent hardness of water is :
(1) Treatment with sodium carbonate
(2) Ion–exchange method
(3) Calgon's method
(4) Clark's method
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20/09/2020 10:42 am
(4) Clark's method
Explanation:
Clark's Method is used to remove temporary hardness by using lime water (or) Ca(OH)2.