Hard water when passed through ion exchange resin containing $R C O O H$ group, becomes free from :

C l^{-}

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S O_{4}^{- 2}

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H_{3} O^{+}

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C a^{+ 2}

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Solution

The correct option is D $C a^{+ 2}$
Hard water contains $C a$ and $M g$ salt so when it is passed through negative ion exchange resin, it capture cations from water and make it free from $C a^{+ 2}$ .

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