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JEE PYQ: Hydrogen Question 13

Question 13 - 2020 (05 Sep Shift 2)

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

(a) Clark’s method (b) Ion-exchange method (c) Calgon’s method (d) Treatment with sodium carbonate

Show Answer

Answer: (a)

Solution

Clark’s method is used to remove temporary hardness using lime water or $\text{Ca(OH)}_2$. It is not suitable for permanent hardness.


Learning Progress: Step 13 of 31 in this series