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Hard water becomes free from......ions when passed through ion exchange resin containing RCOOH groups

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a

${SO}_{4}^{2 -}$

b

CI^-

c

Ca ²⁺

d

$H_{3} O^{+}$

answer is D.

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Detailed Solution

The hardness of water is caused when Ca²⁺ and Mg²⁺ are present in the form of sulfates, phosphates, bicarbonates, nitrates, and so on. The compound that is used for the ion-exchange method usually consists of sodium ions and when it is added to hard water, 2Na⁺ ions are replaced by one Ca²⁺ or one Mg²⁺ ion.

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