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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. Polymerisation of propene using Ziegler–Natta catalyst is advantageous over free-radical polymerisation because:

A

it can lead to living polymers via anionic polymerisation

B

it permits step-growth polymerisation resulting in a highly cross-linked polymer

C

it gives highly branched polymer with a high degree of crystallinity

it gives linear polymer molecules permitting stereochemical control

Explanation

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Q 5. Natural rubber is

A

Trans polyisoprene

Cis polyisoprene

C

Cis and trans isoprene

D

Neoprene

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Q 6. 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 7. Ebonite is

A

polypropene

B

natural rubber

C

synthetic rubber

highly vulcanised rubber

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Q 8. 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 9. Which of the following rubber is not a polydiene?

A

Polyisoprene

B

Polychloroprene

Thiokol

D

Nitrile rubber

Explanation

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Q 10. 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 11. 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 12. 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