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Polymers Test - 42

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Polymers Test - 42
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  • Question 1
    1 / -0
    Which among the following is a cross-linked polymer?
    Solution
    Melamine-formaldehyde polymer is cross-linked polymer or thermosetting polymer which on heating undergo extensive cross linking in moulds and again become infusible. These cannot be reused. Some common examples are bakelite, urea-formaldelyde resins, etc.
    The correct option is [C].
  • Question 2
    1 / -0
    Composition of Ziegler-Natta catalyst is:
    Solution
    Zigler-Natta catalyst is triethylaluminium and titanium(+4) chloride,
    it is used to form high-density polyethene and for manufacturing buckets, dustbins, bottles and pipes etc.
    The correct option is [C].
  • Question 3
    1 / -0
    Synthetic polymer prepared by using caprolactam is known as:
    Solution
    Nylon-6 is the synthetic polymer prepared by using caprolactam. It is obtained by heating caprolactam with water at a high temperature.
    Nylon 6 is used for the manufacture of tire cords, fabrics, and ropes.

  • Question 4
    1 / -0
    Which of the following is a condensation polymer?
    Solution
    Polyester is a type of condensation polymer, This type of polymerisation generally involves a repetitive condensation reaction between two bi-functional monomers. These polycondensation reactions may result in the loss of some simple molecules like water, alcohol, etc and lead to the formation of high molecular mass condensation polymers.
    Example = Dacron, Glyptal.
    Hence, the correct option is $$[C]$$.
  • Question 5
    1 / -0
    Natural rubber is a polymer of:
    Solution
    Natural rubber (poly cis-isoprene) is the polymer of $$2-methyl-1,3\ butadiene$$,
    Rubber is a natural polymer and possesses elastic properties. It is also termed as elastomer and has a variety of uses. It is manufactured from rubber latex which is a colloidal dispersion of rubber in water.
    The correct option is [B].
  • Question 6
    1 / -0
    Which of the following is not an example of rubber?
    Solution
    polyacrylonitrile are used as fibers to make knitted clothing, like socks and sweaters, as well as outdoor products like tents.
    So the correct option is [D].
  • Question 7
    1 / -0
    Terylene is a condensation polymer of ethylene glycol and:
    Solution
    Terylene is a condensation polymer of ethylene glycol and terephthalic acid,
    it is the product of condensation polymerisation, this type of polymerisation generally involves a repetitive condensation reaction between two bi-functional monomers and lead to the formation of high molecular mass condensation polymers.
    The correct option is [C].
  • Question 8
    1 / -0
    Formation of nylons and polyesters are called step growth polymerization because:
    Solution
     These polycondensation reactions result in the loss of some simple molecules as water, alcohol, etc., and lead to the formation of high molecular mass condensation polymers.
    let's look at the formation of nylon polymer
    Nylon 6,6- It is prepared by the condensation polymerisation of hexamethylenediamine with adipic acid under high pressure and at high temperature with the removal of water molecules.
    the correct option is [B].
  • Question 9
    1 / -0
    Which of the following polymers does not involve cross-linkages?
    Solution
    Bakelite, melamine( thermosetting) and vulcanised rubber( elastomer) have cross-linkages in the structures whereas Teflon is linear addition or chain growth polymers that have not cross-linkages.
    the correct option is [D].
  • Question 10
    1 / -0
    Natural rubber or raw rubber consists of basic material latex which is a dispersion of isoprene. During the treatment, this isoprene forms a high molecular weight polymer of isoprene. Natural rubber can be obtained from five hundred different species of plants.
    In the isoprene polymer all the isoprene have:
    Solution
    In the given image, all configurations are in cis-form.
    Rubber is a natural polymer and possesses elastic properties. It is also termed as elastomer and has a variety of uses. It is manufactured from rubber latex which is a colloidal dispersion of rubber in water.

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