A) Passing it through cation exchange resin
B) Passing it through anion exchange resin
C) Passing it through sand
D) Passing it through alumina
Correct Answer: A
Solution :
In cation exchange resin \[M{{g}^{+2}}\] and \[C{{a}^{+2}}\] (cations) are replaced by \[N{{a}^{+}}\] ions.
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