Question

The ion exchange resin which removes metal ions from hard water consists of a giant organic molecule containing.
a.) $- Cl$ group
b.) $- COOH$ group
c.) $- OH$ group
d.) $- N{H_3}$ group

Answer 1

To understand this above question you need to first know about what is an ion exchange resin. An acid resin contains the acid group carboxylic acid. It is an important compound in many processes in chemistry.

Complete step by step answer:
- Giant organic molecules having acidic or basic groups are known as ion exchange resins. Acid resins contain the acidic group carboxylic acid. Acid resins exchange their ${H^ + }$ ions with other cations such as $M{g^{2 + }}$, $C{a^{2 + }}$, etc present in hard water. Therefore, acid resins are known as base exchange resins.
- Ion exchange resins are classified as cation exchange. Which have positively charged mobile ions available for exchange and anion exchange whose exchangeable ions are negatively charged. Resins can be broadly classified as strong or weak as cations exchangers or strong or weak base ion exchangers. The correct option is option “B” .

Additional Information . Ion exchange resins are used to soften water by replacing the cations with sodium ions and possibly the anions with chloride ions of sodium chloride. They may also be used to demineralized water where the cations are placed by ${H^ + }$ ions and the anions are replaced by $O{H^ - }$ ions.
- Ion exchange resins are widely used in different separation, purification and decontamination processes; the most common examples are water softening and water purification. In many cases, ion exchange resins were introduced in such processes as a more flexible alternative to the use of natural or artificial zeolites.

Note: The ion exchange process percolates water through spherical porous bead resin material (ion exchange resins), ions in the water are exchanged for other ions fixed to the beads. The two most form an ion exchange method are softening and deionization.