Question

Hard water when passed through an ion exchange resin containing $RCOONa$ group becomes free from

• A. $C{l}^{-}$
• B. $S{O}_4^{2-}$
• C. $H_3{O}^{+}$
• D. $C{a}^{2+}$

Answer 1

The correct option is D $C{a}^{2+}$

Hard water contains $Ca$ and $Mg$ salt. So, when it is passed through negative ion exchange resin, it captures cations from water and makes it free from $C{a}^{2+}$.