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Polymers · Question 7

NEET 2018MCQMedium📈 Topic in 25% papers+4−1
1

Regarding cross-linked or network polymers, which of the following statements is incorrect?

  1. They contain covalent bonds between various linear polymer chains.
  2. They are formed from bi- and tri-functional monomers.
  3. Examples are bakelite and melamine.
  4. They contain strong covalent bonds in their polymer chains.

Answer

(4) They contain strong covalent bonds in their polymer chains.

Solution

As per NCERT, cross-linked or network polymers are usually formed from bi-functional and tri-functional monomers and contain strong covalent bonds between various linear polymer chains, e.g. bakelite, melamine.

⇒ Statements (A), (B) and (C) are the NCERT description.

Statement (D) speaks of bonds within the polymer chains, which does not describe the cross-links (bonds between the chains) that characterise these polymers.

∴ Statement (D) is incorrect.

Answer: (4)

Out of syllabusNEET 2018

Keep practising — Polymers

2

Natural rubber has

  1. alternate cis- and trans-configuration
  2. random cis- and trans-configuration
  3. all cis-configuration
  4. all trans-configuration.
Out of syllabusNEET 2016 (Phase 1)
3

Which one of the following structures represents nylon 6, 6 polymer?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Out of syllabusNEET 2016 (Phase 2)
4

Caprolactam is used for the manufacture of

  1. teflon
  2. terylene
  3. nylon 6, 6
  4. nylon 6
Out of syllabusAIPMT 2015
5

Biodegradable polymer which can be produced from glycine and aminocaproic acid is

  1. buna - N
  2. nylon 6, 6
  3. nylon 2-nylon 6
  4. PHBV
Out of syllabusAIPMT 2015 (Cancelled)
6

Which of the following organic compounds polymerizes to form the polyester dacron?

  1. Propylene and para HO-(C6H4)-OH
  2. Benzoic acid and ethanol
  3. Terephthalic acid and ethylene glycol
  4. Benzoic acid and para HO-(C6H4)-OH
Out of syllabusAIPMT 2014
7

Which one of the following is an example of thermosetting polymer?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Out of syllabusAIPMT 2014
8

Nylon is an example of

  1. polyamide
  2. polythene
  3. polyester
  4. polysaccharide.
Out of syllabusNEET 2013
9

Which is the monomer of neoprene in the following?

  1. CH2= Cl |C-CH=CH2
  2. CH2=CH-C CH
  3. CH2=CH-CH=CH2
  4. CH2= CH3 |C-CH=CH2
Out of syllabusNEET 2013
10

Which one of the following sets forms the biodegradable polymer?

  1. CH2=CH-CN and CH2=CH-CH=CH2
  2. H2N-CH2-COOH and H2N-(CH2)5-COOH
  3. HO-CH2-CH2-OH and [figure]
  4. [figure] and CH2=CH-CH=CH2
Out of syllabusAIPMT 2012 (Mains)
11

Which one of the following is not a condensation polymer?

  1. Melamine
  2. Glyptal
  3. Dacron
  4. Neoprene
Out of syllabusAIPMT 2012 (Prelims)

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