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Polymers · Question 13

AIPMT 2014MCQEasy📈 Topic in 25% papers+4−1
1

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]

Answer

(4) [figure]

Solution

As per NCERT, thermosetting polymers are cross-linked or heavily branched molecules which, on heating, undergo extensive cross-linking in moulds and become infusible; they cannot be reused. Some common examples are bakelite and urea-formaldehyde resins.

⇒ (1) is neoprene (polychloroprene), an elastomer.

⇒ (2) is polyvinyl chloride (PVC), a thermoplastic polymer.

⇒ (3) is nylon 6,6, a fibre.

⇒ (4) is the phenol–formaldehyde polymer (novolac), which on heating with formaldehyde forms the cross-linked thermosetting polymer bakelite.

∴ The thermosetting polymer is the phenol–formaldehyde polymer (bakelite).

Answer: (4)

Out of syllabusAIPMT 2014

Keep practising — Polymers

2

Nylon is an example of

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

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
4

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)
5

Which one of the following is not a condensation polymer?

  1. Melamine
  2. Glyptal
  3. Dacron
  4. Neoprene
Out of syllabusAIPMT 2012 (Prelims)
6

Which of the following statements is false?

  1. Artificial silk is derived from cellulose.
  2. Nylon-6, 6 is an example of elastomer.
  3. The repeat unit in natural rubber is isoprene.
  4. Both starch and cellulose are polymers of glucose.
Out of syllabusAIPMT 2012 (Prelims)
7

Of the following which one is classified as polyester polymer?

  1. Terylene
  2. Bakelite
  3. Melamine
  4. Nylon-6,6
Out of syllabusAIPMT 2011 (Prelims)
8

Which of the following structures represents neoprene polymer?

  1. [-CH2- Cl |C=CH-CH2- ]n
  2. [-CH2- Cl |CH- ]n
  3. [-CH2- CN |CH- ]n
  4. [- C6H5 |CH-CH2- ]n
Out of syllabusAIPMT 2010 (Prelims)
9

Structures of some common polymers are given. Which one is not correctly presented?

  1. Neoprene : [figure]
  2. Terylene : [figure]
  3. Nylon 6,6 : [figure]
  4. Teflon : [figure]
Out of syllabusAIPMT 2009
10

Which one of the following statements is not true?

  1. Buna-S is a copolymer of butadiene and styrene.
  2. Natural rubber is a 1,4-polymer of isoprene.
  3. In vulcanization, the formation of sulphur bridges between different chains makes rubber harder and stronger.
  4. Natural rubber has the trans-configuration at every double bond.
Out of syllabusAIPMT 2008
11

Which one of the following polymers is prepared by condensation polymerisation?

  1. Teflon
  2. Natural rubber
  3. Polystyrene
  4. Nylon-6,6
Out of syllabusAIPMT 2007

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