Chemistry

Polymers and Plastics

1,228 Questions

Polymers and plastics questions explore the properties, synthesis, and applications of various synthetic and natural polymers. Key topics include biodegradable plastics, vulcanization, and polymer nanocomposites. These concepts are frequently tested in science and engineering competitive exams.

Biodegradable plasticsPolymer nanocompositesVulcanization of rubberPolymer molecular weightAsphalt binders

Polymers and Plastics Questions

Multiple choice

Which of the following pairs of 'polymer : its description' is incorrectly matched?

  1. Cellulose gum : Cellulose derivative with carboxymethyl groups bound to some of the hydroxyl groups of the glucopyranose monomers

  2. Cellodextrin : Indited via the cleavage of cellulose in most anaerobic bacteria by the cellulosome

  3. Cellophane : Created from nitrocellulose and camphor with added dyes and other agents

  4. Cellulose acetate : Acetate ester of cellulose used as a film base in photography

  5. Leatheroid : Cellulose material very similar to vulcanised fibre in physical properties and uses
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This option is correct. Cellophane is a thin, transparent sheet made of regenerated cellulose whereas celluloids are a class of compounds created from nitrocellulose and camphor with added dyes and other agents.

Multiple choice

Which of the following is a biodegradable, non-toxic, biocompatible plastic that is produced naturally by bacteria and is a good alternative to many non-biodegradable synthetic polymers?

  1. PHBV

  2. Spandex

  3. PLGA

  4. ETFE

  5. ECTFE
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This option is correct. PHBV is a biodegradable, non-toxic, biocompatible plastic that is produced naturally by bacteria and is a good alternative to many non-biodegradable synthetic polymers.

Multiple choice

Match List I (polymers) with List II (their description).

 
List I List II
(i) Heparan sulphate a. Sulphonated tetrafluoroethylene based fluoropolymer-copolymer
(ii) Chicle b. Synthetic viscoelastic urethane polymer
(iii) Sorbothane c. Natural gum traditionally used in making chewing gum
(iv) Nafion d. Linear polysaccharide found in all animal tissues

  1. (i) - d, (ii) - c, (iii) - b, (iv) - a

  2. (i) - a, (ii) - c, (iii) - b, (iv) - d

  3. (i) - c, (ii) - d, (iii) - b, (iv) - a

  4. (i) - d, (ii) - b, (iii) - c, (iv) - a

  5. (i) - b, (ii) - d, (iii) - a, (iv) - c
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This option is correct because all the polymers are correctly matched. Heparan sulphate - linear polysaccharide found in all animal tissues Chicle - natural gum traditionally used in making chewing gum Sorbothane - synthetic viscoelastic urethane polymer Nafion - sulphonated tetrafluoroethylene based fluoropolymer-copolymer  

Multiple choice

Match the following.

 
Column - I Column - II
A. Ionomer 1. Polystyrene resin that is based on a copolymer of styrene and chloromethylstyrene
B. Kraton 2. Polymer that comprises repeat units of both electrically neutral repeating units and a fraction of ionised units
C. Merrifield resin 3. High performance elastomer that is used as a synthetic replacement for rubber

  1. A - 1, B - 2, C - 3

  2. A - 3, B - 1, C - 2

  3. A - 2, B - 3, C - 1

  4. A - 2, B - 1, C - 3

  5. A - 3, B - 2, C - 1
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This option is correct because all are correctly matched. Ionomer is a polymer that comprises repeat units of both electrically neutral repeating units and a fraction of ionised units. Kraton is a high performance elastomer that is used as a synthetic replacement for rubber. Merrifield resin is a polystyrene resin that is based on a copolymer of styrene and chloromethylstyrene.  

Multiple choice

Polyurethane is formed when

  1. hexamethylene disocyanate and tetramethylene glycol undergo step reaction polymerisation

  2. melamine and formaldehyde resin give a polymer

  3. phenol and formaldehyde react in presence of dilute acid

  4. adipic acid and hexamethylene polymerise

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hexamethylene diisocyanate and tetramethylene glycol undrego step reaction polymerisation to produce polyurethane.

Multiple choice

Nylon-6, 6 can be prepared from which of the following?

  1. Benzyl chloride

  2. Benzaldehydes

  3. Succinic acid

  4. Adipic acid

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This option is correct because hexamethylene diamine and adipic acid condenses to remove water and makes a large unit of compound called nylon-6, 6.

Multiple choice

Which of the following statements is/are correct?

  1. Polypropylene, because of the presence of several chiral atoms is optically active.

  2. Gutta percha and natural rubber are stereoisomers.

  3. Intermolecular forces of attraction in nylons are dipole-dipole interactions.

  4. Vulcanization introduces hydrogen bondings between polymer chains.

  5. Dacron is a polyamide.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This option is correct because gutta percha is all trans-polyisoprene while natural rubber is all cis-polyisoprene.