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 represents the natural condensation polymers?

  1. Nylon-6 and proteins

  2. Nylon-6 and cellulose

  3. Proteins and natural rubber

  4. Cellulose and natural rubber

  5. Cellulose and proteins
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Proteins are natural condensation polymers made from amino acid monomers. Cellulose is naturally occurring condensation polymer of glucose. Thus, this option is correct.

Multiple choice

Which of the following statements is not correct?

  1. Ziegler-Natta catalyst is used for olefin polymerization.

  2. Perbunan is an example of copolymer.

  3. Azepan-2-one is monomer of nylon-6.

  4. Plexiglass is commercial name of polyethyl acrylate.

  5. Thermocole is a chain growth polymer.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This option is correct because plexiglass is commercial name of polymethyl methacrylate (PMMA).

Multiple choice

Which among the following sets represents condensation polymers?

  1. Glyptal, PVC, orlon, bakelite

  2. Glyptal, PVC, orlon, melamine

  3. Glyptal, melamine, orlon, dacron

  4. Glyptal, dacron, melamine, bakelite

  5. Dacron, teflon, bakelite, styrene
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Dacron, melamine, bakelite and glyptal: All are condensation polymers.

Multiple choice

Which one of the following statements is correct?

  1. Cellophane is a synthetic polymer.

  2. Dacron is a condensation polymer of ethylene glycol and phthalic acid.

  3. Synthetic rubber is condensation polymer of chloroprene.

  4. Caoutchouc has cis configuration at every double bond.

  5. Nylon-66 prepared by addition polymerization.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In caoutchouc (natural rubber), the double bonds are all in the cis configuration.

Multiple choice

Which of the following processes is usually employed for preparation of carbowax from ethylene oxide?

  1. Base-catalysed polymerisation

  2. Acid-catalysed polymerisation

  3. Free-radical polymerisation

  4. Coordination polymerisation

  5. Both options 3 and 4
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This option is correct because both acid and base can be used to open ethylene oxide ring. Since, alkoxide ion is a better nucleophile than alcohol, therefore base catalysed polymerisation is preferred.

Multiple choice

Which of the following is a thermosetting plastic?

  1. Polystyrene

  2. Polyvinyl chloride

  3. Acrylic

  4. Teflon

  5. Bakelite
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Thermosetting plastic, once set after being melted, cannot be moulded again. Bakelite is very hard and a good electrical insulator.

Multiple choice

Find out the correct statement.

  1. Nylon-2-Nylon-6 is non-biodegradable.

  2. Polythene is thermosetting polymer.

  3. Neoprene is a polymer of chloroprene.

  4. Bakelite is a linear polymer.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Neoprene or polychloroprene is formed by the free radical polymerisation of chloroprene.

Multiple choice

Terylene is a polymer of ethylene glycol and

  1. benzoic acid

  2. phthalic acid

  3. terephthalic acid

  4. salicylic acid
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Terylene or Dacron, obtained by interaction of ethylene glycol and terephthalic acid, is an example of condensation polymerisation.

Multiple choice

Flame retardants are chemicals that inhibit or resist the spread of fire. Which of the following substances is primarily used as a flame retardant ?

  1. Zinc acetate

  2. Zinc ammonium chloride

  3. Zinc antimonide

  4. Zinc borate
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Zinc borate is an inorganic compound, a borate of zinc. It is a white crystalline or amorphous powder insoluble in water. Its toxicity is low. Its melting point is 980 °C. It is primarily used as a flame retardant in plastics and cellulose fibers, paper, rubbers and textiles.