Question

Which of the following will cause softening of hard water?

A
Passing it through cation exchange resin
B
Passing it through anion exchange resin
C
Passing it through sand
D
Passing it through alumina
Solution
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Correct option is A. Passing it through cation exchange resin
Passing it through cation exchange resin will cause the softening of hard water. In cation exchange resin $$Mg^{2+}$$ and $$Ca^{2+}$$ (cations) are replaced by $$Na^{+}$$ ions.

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