NEET Previous Year Questions (2014-2024): Polymers (Old NCERT) | Chemistry Class 12 PDF Download

Q.1. Which amongst the following molecules on polymerization produces neoprene?     (2023)
A: H₂C = CH – CH = CH₂
B:
C: H₂C = CH – C ≡ CH
D:
Ans: B
Solution:
Neoprene is formed by free radical polymerisation of chloroprene.


Q.2. Which statement regarding polymers is not correct?    (2022)
A: Thermoplastic polymers are capable of repeatedly softening and hardening on heating and cooling respectively.  
B: Thermosetting polymers are reusable.
C: Elastomers have polymer chains held together by weak intermolecular forces.
D: Fibers possess high tensile strength.
Ans: B
Solution:
Thermosetting are not remoulded or reshaped
∴ They cannot be reused. Rest all statement are correct.

Q.3. Which one of the following polymers are prepared by addition polymerization?      (2021)
A: Novolac
B: Dacron
C: Teflon
D: Nylon-66
Ans: C
Solutions: Teflon are prepared by addition polymerisation from tetrafluroethene.

Nylon-66, Novolac, Dacron are prepared by condensation polymerisation.

Q.4. Which of the following is a natural polymer?      (2020)
A: polybutadiene 
B: poly (Butadiene-acrylonitrile) 
C: cis-1,4-polyisoprene 
D: poly (Butadiene-styrene)
Ans: C
Solution:


Q.5. The biodegradable polymer is:     (2019)
A: Nylon-6,6
B: Nylon-2-Nylon 6
C: Nylon-6
D: Buna-S
Ans: B

Q.6. Regarding cross-linked or network polymers, which of the following statements is incorrect?    (2018)
A: They contain covalent bonds between various linear polymer chains.
B: They are formed from bi-and tri-functional monomers.
C: Examples are bakelite and melamine.
D: They contain strong covalent bonds in their polymer chains.
Ans: D
Solution:
Cross-linked or network polymers are usually formed from bi-functional & tri-functional monomers and contains strong covalent bond between various linear polymer chains like Melamine, Bakelite etc.

Q.7. Natural rubber has:    (2016)
A: Random cis - and trans-configuration
B: All cis-configuration
C: All trans-configuration
D: Alternate cis - and trans - configuration
Ans: B
Solution:
The repeating unit in natural rubber has the cis-configurations with chain extensions on the same side of the ethylene double bond, which is essential for elasticity. If the configuration is trans, the polymer is hard plastic.

All cis-configuration.

Q.8. Biodegradable polymer which can be produced from glycine and aminocaproic acid is:    (2015)
A: Nylon 6, 6
B: Nylon 2 – nylon 6
C: PHBV
D: Buna – N
Ans: B
Solution:
Nylon-2-nylon-6 or Nylon-2,6 is an alternating polyamide co-polymer of glycine and amino caproic acid.

Q.9. Which of the following organic compounds polymerizes to form the polyester Dacron?   (2014)
A: Terephthalic acid and ethylene glycol
B: Benzoic acid and para HO − (C₆H₄) − OH
C: Propylene and para HO − (C₆H₄) − OH
D: Benzoic acid and ethanol
Ans: A
Solution:

Q.10. Which one of the following is an example of a thermosetting polymer?    (2014)
A: