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 statements is/are correct?

  1. Caprolactam is obtained by Beckmann rearrangement of acetophenone oxime.

  2. Gutta percha and natural rubber are stereoisomers.

  3. Denatururation involves changes in the primary structure of proteins.

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

  5. At isoelectric point, an α-amino acid has the minimum solubility.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This option is correct because gutta percha is trans-polyisoprene while natural rubber is cis-polyisoprene. This statement is true because at isoelectric point, an α-amino acid has the minimum solubility. Thus this option is correct.

Multiple choice

Which is not true about polymers?

  1. Polymers do not carry any charge.

  2. Polymers have high viscosity.

  3. Polymers scatter light.

  4. Polymers have low molecular weight.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Polymers are macromolecules characterized by very high molecular weights. The statement that they have low molecular weight is false.

Multiple choice

Polythene is industrially prepared by the polymerization of

  1. methane

  2. acetylene

  3. ethylene

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

Polythene (polyethylene) is a polymer created by the addition polymerization of ethylene (ethene) monomers. The double bond in ethylene breaks to allow the formation of long chains.

Multiple choice

Artificial polymers such as nylon and polystyrene generally behaves as:

  1. lyophobic colloids

  2. macromolecular colloids

  3. multimolecular colloids

  4. associated colloids
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Macromolecular colloidal particles are formed when on dissolution in a suitable solvent, the macromolecules have sizes which are in the colloidal range. Naturally occurring macromolecules are starch, proteins and cellulose. Man made macromolecules are polymers such as polyethylene, nylon and polystyrene. These colloids are quite stable and resemble true solutions in many respects.

Multiple choice

The substance that is not polymeric in nature is

  1. nylon

  2. cellulose

  3. starch

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

Nylon, cellulose, and starch are all polymers (long chains of repeating units). Glucose is a simple sugar (monosaccharide) and is not a polymer.

Multiple choice

Styrene is made up of hydrogen and

  1. oxygen

  2. sulphur

  3. chlorine

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

Styrene is an organic compound with the chemical formula C8H8. It consists of carbon and hydrogen atoms.

Multiple choice

Natural rubber is a polymer of

  1. ethylene

  2. vinyl chloride

  3. isoprene

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

Natural rubber is a polymer made up of repeating units of isoprene (2-methyl-1,3-butadiene).

Multiple choice

An example of a synthetic rubber is

  1. neoprene

  2. nylon

  3. rayon

  4. polyester
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Neoprene is a well-known synthetic rubber (polychloroprene). Nylon, rayon, and polyester are synthetic fibers, not rubbers.