NCERT Class 12 Chemistry Solutions Polymers

NCERT Class 12 Chemistry Solutions Polymers - NCERT Solutions prepared for CBSE students by the best teachers in Delhi. 

Class XII Chemistry

Chapter 15 – Polymers 

Question 1:

Explain the terms polymer and monomer.

Answer

Polymers are high molecular mass macromolecules composed of repeating structural units derived from monomers. Polymers have a high molecular mass (103 - 107 u). In a polymer, various monomer units are joined by strong covalent bonds. Polymers can be natural as well as synthetic. Polythene, rubber, and nylon 6, 6 are examples of polymers. Monomers are simple, reactive molecules that combine with each other in large numbers through covalent bonds to give rise to polymers. For example, ethene, propene, styrene, vinyl chloride.


Question 2:

What are natural and synthetic polymers? Give two examples of each type.

Answer

Natural polymers are polymers that are found in nature. They are formed by plants and animals. Examples include protein, cellulose, starch, etc. Synthetic polymers are polymers made by human beings. Examples include plastic (polythene), synthetic fibres (nylon 6, 6), synthetic rubbers (Buna - S).


Question 3:

How do you explain the functionality of a monomer?

Answer

The functionality of a monomer is the number of binding sites that is/are present in that monomer.


Question 4:

Define the term polymerisation.

Answer

Polymerization is the process of forming high molecular mass (103 − 107 u) macromolecules, which consist of repeating structural units derived from monomers. In a polymer, various monomer units are joined by strong covalent bonds.


Question 5:

In which classes, the polymers are classified on the basis of molecular forces?

Answer

On the basis of magnitude of intermolecular forces present in polymers, they are classified into the following groups:

(i) Elastomers

(ii) Fibres

(iii) Thermoplastic polymers

(iv) Thermosetting polymers

 

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