06: Polymers : Neet-xii-chemistry

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NEET-XII-Chemistry

06: Polymers

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6 - Polymers

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Section : I
SECTION I Page No 428:

Qstn #1
What are polymers?

Ans : Polymers are high molecular mass macromolecules, which consist 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. These polymers can be natural as well as synthetic. Polythene, rubber, and nylon 6, 6 are examples of polymers.

Qstn #2
How are polymers classified on the basis of structure?

Ans : Addition polymers:

Polyvinyl chloride, polythene

Condensation polymers:

Terylene, bakelite

Qstn #3
Write the names of monomers of the following polymers:

#3-i
Ans : Hexamethylenediamine and adipic acid

#3-ii
Ans :

#3-iii
Ans : Tetrafluoroethene

Qstn #4
Classify the following as addition and condensation polymers: Terylene, Bakelite, Polyvinyl chloride, Polythene.

Ans : Addition polymers:

Polyvinyl chloride, polythene

Condensation polymers:

Terylene, bakelite

Qstn #5
Explain the difference between Buna-N and Buna-S.

Ans : Buna - N is a copolymer of 1, 3-butadiene and acrylonitrile.

Buna - S is a copolymer of 1, 3-butadiene and styrene.

Qstn #6
Arrange the following polymers in increasing order of their intermolecular forces.

Ans : Different types of polymers have different intermolecular forces of attraction. Elastomers or rubbers have the weakest while fibres have the strongest intermolecular forces of attraction. Plastics have intermediate intermolecular forces of attraction. Hence, the increasing order of the intermolecular forces of the given polymers is as follows:

Qstn #6-i
Nylon 6, 6, Buna-S, Polythene.
Ans : Buna - S < polythene < Nylon 6, 6

Qstn #6-ii
Nylon 6, Neoprene, Polyvinyl chloride.
Ans : Neoprene < polyvinyl chloride < Nylon 6

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Section : II
SECTION I Page No 437:

Qstn #1
Explain the terms polymer and monomer.

Ans : 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.