Question

4 give a stepwise procedure of making rayon
5 what is 4r principal ? describe ?
6 write the versatile properties of Nylon fibre ?​

Answer 1

Answer:

The 4R means Reduce, Reuse, Recycle and Restore.

(i) Reduce: We should reduce the use of non-biodegradable compounds that are harmful to us.

Example: Instead of using polythene bags we should give preference to paper bags.

(ii) Reuse: We should reuse the materials instead of dumping them.

Example: Plastic bags can be reused to make decorative things.

Answer 2

Answer:

4 To make rayon, sheets of purified cellulose are steeped in caustic soda, dried, shredded into crumbs, and then aged in metal containers for 2 to 3 days. The temperature and humidity in the metal containers are carefully controlled.

5 The 4R principle stands for the 4 words reduce, reuse, recycle and recover.

6

Properties of Nylon

Lustrous.

Elastic.

Very strong.

Damage resistant to oil and many chemicals.

Resilient.

Does not absorb water.

Dries quickly.