Question

Hard water when passed through ion exchange
resin containing R’COOH groups, becomes free
from :
(a) Cl⁻ (b) SO²⁻₄
(c) H₃O⁺ (d) Ca²⁺

Answer 1

Explanation:

Ca2+

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Answer 2

(c) H₃O⁺ (d)  is the answer ush