A) Ion-exchange method
B) Synthetic resins method
C) Calgon's method
D) clark's method
Correct Answer: D
Solution :
Clark?s method is used to remove temporary hardness \[Ca{{(HC{{O}_{3}})}_{2}}+C{{a}^{+2}}\text{ }or\text{ }M{{g}^{+2}}\to CaC{{O}_{3}}\] \[or\text{ }MgC{{O}_{3}}+{{H}_{2}}O\]
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