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JEE Main

Explore popular questions from Polymers for JEE Main. This collection covers Polymers previous year JEE Main questions hand picked by experienced teachers.

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Polymers

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Q 1. Which of the following polymer exhibit a lower value of molar cohesion?

A

wool

B

silk

vulcanized rubber

D

polystyrene

Explanation

Rubbers have the lowest value of molar cohesion in comparison to plastics and fibres.

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Q 2. Which of the following is correct about thermosetting polymers?

A

Thermosetting polymers are cross-linked polymers.

B

They do not melt (or soften) on heating.

C

Cross-linking is usually developed at the time of moulding where they harden irreversibly.

All of the above

Explanation

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Q 3. Which one of the following compounds is polyester?

A

Bakelite

B

Nylon {tex} 6,6 {/tex}

Terylene

D

Rubber

Explanation

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Q 4. Natural rubber is

A

Trans polyisoprene

Cis polyisoprene

C

Cis and trans isoprene

D

Neoprene

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Q 5. Which of the following sets forms the biodegradable polymer?

A

{tex} \mathrm { H } _ { 2 } \mathrm { C } = \mathrm { CH } - \mathrm { CN } {/tex} and {tex} \mathrm { H } _ { 2 } \mathrm { C } = \mathrm { CH } - \mathrm { CH } = \mathrm { CH } _ { 2 } {/tex}

B

{tex} \mathrm { H } _ { 2 } \mathrm { N } - \mathrm { CH } _ { 2 } - \mathrm { COOH } {/tex} and {tex} \mathrm { H } _ { 2 } \mathrm { N } - \left( \mathrm { CH } _ { 2 } \right) _ { 5 } - \mathrm { COOH } {/tex}

D

Explanation

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Q 6. Ebonite is

A

polypropene

B

natural rubber

C

synthetic rubber

highly vulcanised rubber

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Q 7. Which of the following polymers cannot be made by free radical addition polymerisation mechanism?

A

PE

B

HDPE

C

LDPE

Teflon

Explanation

The polymers polyethene (PE), low density polyethene(LDPE), high density polyethene(HDPE) and teflon (polytetrafluoroethylene) can be made by free radical addition polymerisation (also known as chain growth polymerisation) mechanism. To obtain free radicals, initiators such as benzoyl peroxide, tert-butyl peroxide or acetyl peroxide are used.

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Q 8. Which of the following rubber is not a polydiene?

A

Polyisoprene

B

Polychloroprene

Thiokol

D

Nitrile rubber

Explanation

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Q 9. The monomer of the polymer is

B

{tex} \mathrm { CH } _ { 3 } - \mathrm { CH } = \mathrm { CH } - \mathrm { CH } _ { 3 } {/tex}

C

{tex} \mathrm { CH } _ { 3 } - \mathrm { CH } = \mathrm { CH } _ { 2 } {/tex}

D

Explanation

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Q 10. Which of the following sets contains only copolymers?

SBR. Glyptal, Nylon- {tex} 6,6 {/tex}

B

Polythene, polyester, PVC

C

Nylon- {tex} 6 , {/tex} butyl rubber, Neoprene

D

Melmac, Bakelite, Teflon

Explanation

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Q 11. Gutta-percha is

A

Trans-polyisoprene

B

Non-elastic and softens to a plastic-like material on heating

C

Used in underwater cables and golf balls

All of the above

Explanation

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Q 12. Formation of polyethylene from calcium carbide takes place as follows:

The amount of polyethylene obtained from 64.1 kg of {tex}\mathrm {CaC_2}{/tex} is

A

7 kg

B

14 kg

C

21 kg

28 kg

Explanation

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Q 13. What is true regarding vulcanisation of rubber?

A

Rubber molecules are joined through {tex} \mathrm { S } - \mathrm { S } {/tex} linkage at the ends.

Rubber molecules are linked through {tex} \mathrm { S } - \mathrm { S } {/tex} linkage at the various parts of polymer backbone.

C

Vulcanisation makes rubber perfectly crystalline.

D

Vulcanisation converts rubber into a thermosetting polymer.

Explanation

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Q 14. A polyurethane is the product of

toluene- {tex} - 2,6 {/tex} -disocyanate and ethylene glycol in presence of a blowing agent

B

E-caprolactum and ethylene glycol

C

terephthalic acid and ethylene glycol

D

an isocyanate and an alcohol

Explanation

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Q 15. Nylon is classified as a condensation polymer because

A

in its preparation a solid is formed from liquid monomers

B

its structure contains the peptide linkage, {tex} - \mathrm { CONH } - {/tex}

C

it can be prepared from aqueous solutions of its monomers

a small molecule is eliminated in its formation from its monomers

Explanation

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Q 16. Given the polymers, A = Nylon 6-6; B = Buna-S; C = Polythene Arrange these in decreasing order of their intermolecular forces.

{tex} \mathrm {A > C > B} {/tex}

B

{tex} \mathrm {B > C > A }{/tex}

C

{tex} \mathrm {A > B > C }{/tex}

D

{tex} \mathrm { C } > \mathrm { B } > \mathrm { A } {/tex}

Explanation

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Q 17. Polymer formation from monomers starts by

condensation reaction between monomers

B

coordinate reaction between monomers

C

conversion of monomer to monomer ions by protons

D

hydrolysis of monomers.

Explanation


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Q 18. Which one among the following is a thermosetting plastic

A

PVC

B

PVA

Bakelite

D

Perspex

Explanation

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Q 19. The basis on the mode of their formation, the polymers can be classified

A

As addition polymers only

B

As condensation polymers only

C

As copolymers

Both as addition and condensation polymers

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Q 20. 'Cis-1, 4-polyisoprene' is

A

Thermoplastic

B

Thermosetting plastic

Elastic (rubber)

D

Resin

Explanation

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Q 21. Which of the following is not a polymer

A

Wool

B

Cotton

C

Leather

Fat

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Q 22. Melmoware are

Thermosetting

B

Thermoplastic

C

Both (a) and (b)

D

None of these

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Q 23. Which of the following is thermoplastic

A

Nylon

B

Polyethylene

C

Terylene

All of these

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Q 24. Which of the following is an example of condensation polymer

A

Nylon

B

Bakelite

C

Urea-formaldehyde resin

All of these

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Q 25. Which of the following is a natural polymer

A

Polyester

B

Glyptal

Starch

D

Nylon- 6

Explanation