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Polymers Test - 49

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Polymers Test - 49
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  • Question 1
    1 / -0
    Chain-growth polymerization may proceed by the following mechanism:
    Solution
    Chain-growth polymerisation may proceed through any of the above mechanism.
    Hence, Option "D" is the correct answer.
  • Question 2
    1 / -0
    Benzene is a polymer of
    Solution

  • Question 3
    1 / -0
    A polyamide polymer is:
    Solution
    Nylon is a polyamide polymer characterized by the presence of amide groups in the main polymer chain. Nylon 6 is produced from caprolactam by ring-opening polymerization. 

    Since caprolactam contains six carbon atoms and only one monomer is used, the polymer is thus designated as nylon 6.

    Hence the correct option is D. 
  • Question 4
    1 / -0
    X and Y are:

    Solution
    Isoprene on 1,4-cis addition forms natural rubber but on 1,4-trans addition forms gutta percha.
    Hence, Option "A" is the correct answer.
  • Question 5
    1 / -0
    Phenol gives two polymers on condensation with formaldehyde:

    X and Y are

    Solution
    Phenol on reaction with a small amount of HCHO in acidic medium forms Novolak whereas phenol on reaction with excess amount of HCHO in basic medium forms bakelite.

    Hence, Option "B" is the correct answer.
  • Question 6
    1 / -0
    Which one of the following is an example of co-polymer?
    Solution
    Teflon, PVC & Polyisoprene are examples of Homopolymers whereas Buna-S is an example of copolymer.
    Hence, Option "B" is the correct answer.
  • Question 7
    1 / -0
    Nylon is:
    Solution
    Nylon is a generic designation for a family of synthetic polymers, based on aliphatic or semi-aromatic polyamides. Nylon is a thermoplastic silky material that can be melt-processed into fibers, films or shapes. It is made of repeating units linked by amide links similar to the peptide bonds in proteins.
  • Question 8
    1 / -0
    1,3-Butadine and styrene on polymerisation give: 
    Solution
    The rubber obtained is also called Styrene butadiene rubber (SBR). In Buna-S, $$Bu$$ stands for butadiene and, $$Na$$ for sodium and $$S$$ for styrene. It is vulcanised with sulfur. The rubber is slightly inferior to natural rubber in its physical properties.
  • Question 9
    1 / -0
    Dacron is an example of:
    Solution
    The polyester Dacron and the polyamide Nylon 6,6, are two examples of synthetic condensation polymers, also known as step-growth polymers.
  • Question 10
    1 / -0
    Which of the following is not made up of polyamides?
    Solution
    All polyamides are made by the formation of an amide function to link two molecules of monomer together. The monomers can be amides themselves (usually in the form of a cyclic lactam such as caprolactam),amino acids or a stoichiometric mixture of a diamine and a diacid.
    Therefore the correct answer is option A. 
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