First slide

Hardness of water

Question

Which of the following will cause softening of hard water ?

Moderate

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

In cation exchange resin ${Mg}^{+ 2} and {Ca}^{+ 2}$ (cations) are replaced by $N a^{+}$ ions.

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