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Polymers

Description: polymers .addition,condensation
Number of Questions: 15
Created by:
Tags: polymers homopolymers copolymers vulcanization bakelite Polymers Chemistry Condensation Polymerisation
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Which of the following is/are the monomer unit(s) of bakelite?

  1. Isoprene

  2. Styrene

  3. Melamine and formaldehyde

  4. Phenol and formaldehyde

  5. None of the above

Show answer
Correct Option: D
Explanation:

Phenol and formaldehyde units combine to form bakelite.

What is the monomeric unit of neoprene?

  1. 2-chloro-1, 3-butadiene

  2. 1, 3-butadiene

  3. 2-methyl-1, 3-butadiene

  4. 3-methyl-1, 3-pentadiene

  5. None of the above

Show answer
Correct Option: C
Explanation:

It is the monomer unit of natural rubber which is also called polyisoprene.

Which of the following polymers is used for making non-stick surface coated utensils?

  1. Bakelite

  2. Neoprene

  3. Polyacrylonitrile (PAN)

  4. Teflon

  5. None of the above

Show answer
Correct Option: D
Explanation:

It is a polymer of tetra-fluroethylene and is used for the coating of non-stick surfaces of utensils.

What is the name of the monomeric unit of nylon-6?

  1. Caprolactum

  2. Adipic acid and hexamethylenediammine

  3. Phenol and formaldehyde

  4. Styrene

  5. Ethene

Show answer
Correct Option: A
Explanation:

It is the monomer unit of nylon-6 and contains six carbon atoms.

Which of the following is a copolymer?

  1. Buna-S

  2. Terylene

  3. Polythene

  4. Novolac

  5. None of the above

Show answer
Correct Option: A
Explanation:

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

Which of the following is true regarding a polymer?

  1. All polymers are macromolecules but all macromolecules are not polymers.

  2. All macromolecules are polymers but all polymers are not macromolecules.

  3. Polymers having low degree of polymerization are called high polymers.

  4. Starch and cellulose are the examples of synthetic polymers.

  5. All of the above

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Correct Option: A
Explanation:

This is because a polymer has repeating structural units but a macromolecule may or may not have.

Polyvinylchloride belongs to which category of polymers?

  1. Manmade polymer

  2. Natural polymer

  3. Biodegradable polymer

  4. Semi-synthetic polymer

  5. None of the above

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Correct Option: A
Explanation:

PVC is an example of manmade polymer or synthetic polymer.

What is the linkage involved between monomers of isoprene for the formation of natural rubber?

  1. 2, 4-addition

  2. 1, 4-addition

  3. 1, 4-condensation

  4. 4, 4-addition

  5. 4, 4-condensation

Show answer
Correct Option: B
Explanation:

The two carbons of two isoprene units are linked through C1 and C4.

Natural rubber is heated with sulphur bridges at many sites between the polymeric chains. What is this process called?

  1. Vulcanization

  2. Oligomerization

  3. Sulphurization

  4. Coplymerization

  5. None of the above

Show answer
Correct Option: A
Explanation:

Natural rubber lacks cross-links which are present in vulcanized rubber.

Which of the following statements is not true?

  1. Elastomers are rubber like solids with elastic properties.

  2. Fibrous polymers involve strong intermolecular forces.

  3. Thermoplastic polymers soften on heating and harden on cooling.

  4. Thermosetting polymers are infusible due to large number of cross bonds.

  5. All statements are correct

Show answer
Correct Option: E
Explanation:

Right interpretation.

What is the percentage of sulphur used in the vulcanization process?

  1. 7%

  2. 1%

  3. 3%

  4. 10%

  5. 5%

Show answer
Correct Option: E
Explanation:

Five percent of sulphur is used in the cross-linking of natural rubber which is also called as vulcanization.

Which of the following polymers is also known as gutta-purcha?

  1. Trans-polyisoprene

  2. Cis-polyisoprene

  3. Buna-S

  4. Buna-N

  5. None of the above

Show answer
Correct Option: A
Explanation:
  • CH2-CH2- groups of the monomers lie on the trans positions leading to the formation of gutta-purcha.

What is the intermediate formed during the formation of bakelite?

  1. Novolac

  2. PAN

  3. PVC

  4. Terylene

  5. None of the above

Show answer
Correct Option: A
Explanation:

It is formed by the combination of phenol and formaldehyde. Novolac further undergoes cross linking with the help of formaldehyde to form bakelite.

Which of the following types of polymerisation is also called step-growth polymerisation?

  1. Addition polymerisation

  2. Condensation polymerisation

  3. Cross-linked polymerisation

  4. Homopolymerisation

  5. Copolymerisation

Show answer
Correct Option: B
Explanation:

It is called step-growth polymerisation as the polymer is formed by the condensation of two monomers in one or many steps.

Which of the following is/are used as initiator(s) in the formation of low density polythene?

  1. Triethylaluminium

  2. Hydrogen peroxide (H2O2)

  3. Ethene

  4. Ziegler-Natta catalyst

  5. All of the above

Show answer
Correct Option: B
Explanation:

It is used as an initiator to start the polymerisation by forming free radicals of form LDP.

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