Which of the following pairs of ions makes the water hard?
Na+
Cs+
Rb+
Ba+2
A
Rb+
B
Na+
C
Ba+2
D
Cs+
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Solution
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The correct option is ANa+ Ion-exchange resin can soften both temporary and permanent hard water. The ion-exchange resin starts with sodium ions struck to it. As the bond water passes through the column, sodium ions come off the resin and go into the water.
Thus, Na+ ions makes the water hard.
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