Solution:

Thermoplastic: These are composed of linear and long chain straight or slightly branched molecules. They can be resoftened and remelted by application of heat and pressure. The materials which can be remelted to manufacture fresh new products are called as thermoplastics

Properties (Any four 1/2 mark each)

1) They are highly plastic

2) They are easily moulded or shaped.

3) They have low melting point

4) As they can be repeatedly used so they have good resale value

5) Relatively soft and ductile i.e not more stronger and harder

6) Cannot be used at high temperature as they tend to soft under heat

7) Usually soluble in some organic solvents.