a) Differentiate between thermoplastics and thermosetting plastics with an example each.
b) Write the monomer unit of Teflon and write any one use of Teflon.

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Solution

(a)
Thermoplastic Thermosetting Plastic
Loses their shape on heating. They can be moulded and remoulded by heating. Set on heating and become irreversibly hard on cooling.
Ex : Polyvinyl chloride or polystyrene Ex : Bakelite or silicones or epoxy resins

(b) The monomer unit of Teflon is Tetrafluoroethene, $C F_{2} = C F_{2}$ .
Teflon is usesd in the parts of electrical devices or coating vessels.

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Column A	Column B
(i) Thermoplastics	(a) Handles of utensils, floor tiles
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(iv) Fire proof plastic	(d) Wood
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Thermoplastic	Thermosetting Plastic
Loses their shape on heating. They can be moulded and remoulded by heating.	Set on heating and become irreversibly hard on cooling.
Ex : Polyvinyl chloride or polystyrene	Ex : Bakelite or silicones or epoxy resins