JEE Main · 2021 · 17 Mar 2021 · Shift 2 · Hydrogen

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The functional groups that are responsible for the ion-exchange property of cation and anion exchange resins, respectively, are:

(A) $- SO_{3} H$ and $- NH_{2}$ ✓ Correct
(B) $- SO_{3} H$ and $- COOH$
(C) $- NH_{2}$ and $- COOH$
(D) $- NH_{2}$ and $- SO_{3} H$

Answer: (A)

Solution

A cation exchange resin must carry an acidic group that can give up a hydrogen ion and hold a metal cation in its place, and the sulphonic acid group

- S O_{3} H

of a sulphonated styrene-divinylbenzene resin does exactly this. An anion exchange resin must carry a basic group that takes up a proton and becomes positively charged, so that it can bind an anion from solution; the amino group

- N H_{2}

serves here. The groups responsible are

- S O_{3} H

for cation exchange and

- N H_{2}

for anion exchange.

JEE Main · 2021 · 17 Mar 2021 · Shift 2 · Single correct option

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