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Question

Hard water when passed through ion exchange resin containing RCOOH group, becomes free from :
  1. Cl
  2. SO24
  3. H3O+
  4. Ca+2

A
Cl
B
Ca+2
C
H3O+
D
SO24
Solution
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Hard water contains Ca and Mg salt so when it is passed through negative ion exchange resin, it capture cations from water and make it free from Ca+2.

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