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Hard water is passed through an ionic exchange resin containing -$SO_3H$ group.The out coming water is free from the following ions.

$\begin{array}{1 1}(a)\;Cl^-\\(b)\;NO_3^-\\(c)\;H_3O^+\\(d)\;Ca^{++}\end{array}$

1 Answer

Cationic exchange resin.
Hence (d) is the correct answer.
answered Jan 23, 2014 by sreemathi.v
 

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