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
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Solution
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Correct option is A)
Passing it through cation exchange resin will cause the softening of hard water. In cation exchange resin Mg2+ and Ca2+ (cations) are replaced by Na+ ions.