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Which of the functional groups are not present in cation exchangers?

(a) SO3^–

(b) OPO3^–

(c) NR3^+

(d) COO^–

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I want to ask this question from Enzymes Purification in division Enzymes Purification of Enzyme Technology

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Right answer is (c) NR3^+

The best explanation: NR3^+ is functional group present in anion exchangers. Cation exchangers have anionic functional groups such as SO3^–, OPO3^– and COO^–.

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