Question

State whether true or false :

Cation and anion exchange resins are used in the ion-exchange process.

• A. True
• B. False

Answer 1

The correct option is A True

The ion - exchange resins are synthetic organic polymers (e.g., polystyrene).

These polymers contain exchangeable cations or anions.

In cation exchange resin, sodium ions are exchanged by calcium and magnesium ions from hard water. Thus, helps in softening of water.

Example :- zeolites alumino-silicate polymer with exchangeable sodium ions :

$2NaAlS{i}_2{O}_6+C{a}^{2+}\to Ca(AlS{i}_2{O}_6{)}_2+2N{a}^{+}$

The hardness is thus removed.

Similarly, anion exchange resins have exchangeable anions including $C{l}^{-},S{O}_4^{2-},O{H}^{-}$.

An anion resin is one that exchanges negative ions.

Therefore, option A is correct.