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Class 12 Polymers MCQs with Answer

Class 12 Chemistry Polymers MCQs with Answer

Q1. Which of the following polymers can have strong intermolecular forces?

  1. Nylon.
  2. Polystyrene.
  3. Rubber.
  4. Polyesters.
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Ans: 1. Nylon.

  1. Polyesters.
    Explanation:
    Polyamides: These polymers possessing amide linkages are important examples of synthetic fibres and are termed as nylons.
    Polyesters: These are the polycondensation products of dicarboxylic acids and diols. Dacron or terylene is the best-known example of
    polyesters

Q2. Which of the following is not a semisynthetic polymer?

  1. Cis-polyisoprene.
  2. Cellulose nitrate.
  3. Cellulose acetate.
  4. Vulcanised rubber.
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Ans: 1. Cis-polyisoprene.
Explanation:
Cis-polyisoprene is not a semisynthetic polymer whereas other is semisynthetic polymers.

Q3. Which of the following monomers form biodegradable polymers?

  1. 3-hydroxybutanoic acid + 3-hydroxypentanoic acid.
  2. Glycine + amino caproic acid.
  3. Ethylene glycol + phthalic acid.
  4. Caprolactum.
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Ans: 1. 3-hydroxybutanoic acid + 3-hydroxypentanoic acid.

  1. Glycine + amino caproic acid.

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Q5. Which of the following are example of synthetic rubber?

  1. Polychloroprene.
  2. Polyacrylonitrile.
  3. Buna-N.
  4. cis-polyisoprene.
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Q7. Which of the folloiwng are characteristics of thermosetting polymers?

  1. Heavily branched cross linked polymers.
  2. Linear slightly branched long chain molecules.
  3. Become infusible on moulding so cannot be reused.
  4. Soften on heating and harden on cooling, can be reused.
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Ans: 1. Heavily branched cross linked polymers.

  1. Become infusible on moulding so cannot be reused.
    Explanation:
    Thermosetting polymers: These polymers are cross linked or heavily branched molecules, which on heating undergo extensive cross
    linking in moulds and again become infusible. These cannot be reused.

Q8. Which of the following polymers have vinylic monomer units?

  1. Acrilan.
  2. Polystyrene.
  3. Nylon.
  4. Teflon.
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Ans: 4. Nylon-6
Explanation:
It is obtained by heating caprolactum with water at a high temperature.

Q10. Which of the following polymers are condensation polymers?

  1. Bakelite.
  2. Teflon.
  3. Butyl rubber.
  4. Melamine formaldehyde resin.
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Ans: 1. Bakelite

  1. Melamine formaldehyde resin.
    Explanation:
    Bakelite is a condensation polymer of phenol and formaldehyde. Melamine formaldehyde resin is a condensation polymer of
    melamine (2, 4, 6-triamino-1, 3, 5-triazine) and formaldehyde.

Q11. Which of the following polymers of glucose is stored by animals?

  1. Cellulose.
  2. Amylose.
  3. Amylopectin.
  4. Glycogen.
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Ans: 4. Glycogen.

Explanation:
Glycogen is a polymer of glucose found in lever, brain and muscles of animals.

Q12. Which of the following polymers, need atleast one diene monomer for their preparation?

  1. Dacron.
  2. Buna-S.
  3. Neoprene.
  4. Novolac.
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Q13. The commercial name of polyacrylonitrile is _.

  1. Dacron.
  2. Orlon (acrilan).
  3. PVC.
  4. Bakelite.
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Q14. Vulcanisation makes rubber __.

  1. More elastic.
  2. Soluble in inorganic solvent.
  3. Crystalline.
  4. More stiff.
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Ans: 1. More elastic.

  1. More stiff.
    Explanation:
    To improve upon physical properties of natural rubber a process of vulcanisation is carried out. This process consists of heating a
    mixture of raw rubber with sulphur and an appropriate additive at a temperature range between 373K to 415K. On vulcanisation,
    sulphur forms cross links at the reactive sites of double bonds and thus the rubber gets stiffened.

Q15. Which of the following polymers are used as fibre?

  1. Polytetrafluoroethane.
  2. Polychloroprene.
  3. Nylon.
  4. Terylene.
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Ans: 3. Nylon.

  1. Terylene.
    Explanation:
    Fibres are the thread forming solids which possess high tensile strength and high modulus. These characteristics can be attributed to
    the strong intermolecular forces like hydrogen bonding. These strong forces also lead to close packing of chains and thus impart
    crystalline nature. The examples are polyamides (nylon 6, 6), polyesters (terylene), etc.