Polymers

NEET Chemistry · 72 questions · Page 1 of 8 · Click an option or "Show Solution" to reveal answer

Which among the following is not a polyester?

A Novolac

B PHBV

C Dacron

D Glyptal

Correct Answer

Option A

Solution

Novolac is a linear polymer of [Ph-Oh + HCHO]. So ester linkage not present. So novolac is not a polyester.

Which among the following is a thermoplastic polymer?

A Melamine polymer

B Bakelite

C Polythene

D Urea-formaldehyde resin

Correct Answer

Option C

Solution

$\bullet$ Polythene is an example of thermoplastic polymer.

Melamine polymer, Bakelite and Urea-formaldehyde resin are thermosetting polymers.

Which statement regarding polymers is not correct?

A Elastomers have polymer chains held together by weak intermolecular forces

B Fibers possess high tensile strength

C Thermoplastic polymers are capable of repeatedly softening and hardening on heating and cooling respectively

D Thermosetting polymers are reusable

Correct Answer

Option D

Solution

$\bullet$ Thermoplastic polymers are the linear or slightly long chain molecules capable of repeatedly softening and hardening on cooling.

$\bullet$ Thermosetting polymers are cross-linked or heavily branched molecules, which on heating undergo extensive cross-linking in moulds and again become infusible.

These cannot be reused.

$\bullet$ Elastomers have polymer chains held together by weak intermolecular forces.

$\bullet$ Fibres possess high tensile strength.

Which one of the following polymers is prepared by addition polymerisation?

A Dacron

B Teflon

C Nylon-66

D Novolac

Correct Answer

Option B

Solution

Dacron, Nylon-66 and Novolac are prepared by condensation polymerisation.

Teflon is an addition polymer.

Monomer of teflon is tetrafluoroethene.

The reagent 'R' in the given sequence of chemical reaction is :

A CuCN/KCN

B H 2 O

C CH 3 CH 2 OH

D HI

Correct Answer

Option C

Solution

Reagent R is C 2 H 5 OH with diazonium salt.

Which of the following is a natural polymer?

A poly (Butadiene-styrene)

B polybutadiene

C poly (Butadiene-acrylonitrile)

D cis-1, 4-polyisoprene

Correct Answer

Option D

Solution

Naturally occurring polymer, natural rubber is cis-1, 4-polyisoprene.

The biodegradable polymer is :

A nylon-6

B Buna-S

C nylon-6, 6

D nylon-2-nylon 6

Correct Answer

Option D

Solution

Biodegradable polymer is Nylon-2-Nylon-6.

Regarding cross-linked or network polymers, which of the following statements is incorrect?

A They contain covalent bonds between various linear polymer chains.

B They are formed from bi- and tri-functional monomers.

C Examples are bakelite and melamine.

D They contain strong covalent bonds in their polymer chains.

Correct Answer

Option D

Solution

Cross-linked or network polymers are usually formed from bi-functional & tri-functional monomers and contains strong covalent bond between various linear polymer chains like Melamine, Bakelite etc.

Natural rubber has

A alternate cis - and trans -configuration

B random cis - and trans -configuration

C all cis -configuration

D all trans -configuration.

Correct Answer

Option C

Solution

Natural rubber is cis-polyisoprene.

Q10

Nylon is an example of

A polyamide

B polythene

C polyester

D polysaccharide.

Correct Answer

Option A

Solution

Nylon is a polyamide.

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