Question

Polystyrene and PVC are thermoplastics.
(A) True
(B) False

Answer 1

Hint: In the above question, we have to see what is a thermoplastic and then we have to find whether polystyrene and PVC satisfies the definition of thermoplastic. Thermoplastic is normally a polymer which degree of softness is inversely proportional to the temperature.

Complete step by step solution
A thermoplastic is a material or we can say it is a plastic polymer, which becomes more soft when heated and hard when cooled. It can be cooled and heated several times without any change in its chemical or mechanical properties. The material can tolerate the temperature upto a certain extent, if a material is heated above its melting point then it gets converted into liquid.
Thermoplastic materials have many features. Some products made from thermoplastic materials are used in electronic applications.
One of the most important properties of thermoplastic materials is that it is transparent, hard and inflammable, very bright and inert against many corrosive agents. It can be given shiny or opaque colours. Polystyrene is a thermoplastic commonly used to replace glass, aluminium and wood because it is cheaper.
 PVC is a very versatile thermoplastic which is resistant to wear and tear, chemical and atmospheric agents and fire. Hence, it is used in the paper industry and for packaging, food containers, credit cards, furnishings, clothing and toys.
Hence, the statement given Polystyrene and PVC are thermoplastics is correct.
Hence, option A is the correct option.

Note
Since, we know that thermoplastics are plastics which get softened when heated and can be reshaped and hence, they cannot be used in heaters, plugs, laptop chargers etc.