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Polymers Test - 39

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Polymers Test - 39
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  • Question 1
    1 / -0
    'Guttapercha' is a tough, crystalline, thermoplastic. It is:
    Solution
    Guttapercha is a tough plastic substance obtained from the latex of several trees.
    Guttapercha is also called as polyterpene- a polymer of isoprene or polyisoprene. Guttapercha is a thermoplastic of natural rubber (isoprene).
    It is an excellent non-conductor and is used in insulating marine and underground cables.
  • Question 2
    1 / -0
    Rubber is very soft. Therefore, it is vulcanized and used in tires. Vulcanised rubber resists:
    Solution
    Vulcanization is the process by which rubber molecules are cross linked with each other by heating the liquid rubber with sulphur. Crosslinking increases the strength and elasticity of rubber. It is very elastic such that it can be stretched reversible.
  • Question 3
    1 / -0
    Natural rubber is obtained as 'latex', which is a milky, white fluid from rubber trees. Latex is a:
    Solution
    Natural rubber latex is basically a colloidal dispersion of rubber hydrocarbon in an aqueous medium. Ammonium and potassium alums are used as a coagulant in latex.
  • Question 4
    1 / -0
    Which of the following polymers is used to manufacture clothes for firefighters?
    Solution
    Nomex is used to manufacture clothes for firefighters . It is also used to prepare protective clothes for race car drivers. Dynel is used in the preparation of human hair wigs. Thiokol is used in rubber. Kevlar is used to prepare bullet proof vests and helmets.
  • Question 5
    1 / -0
    Select the option that correctly identifies the chemical bonds present in the given biomolecules. 
    Polysaccharides - A, Proteins - B, Fats - C, Water - D
    Solution
    • In polysaccharides, monosaccharides are linked together by glycosidic bond $$(C-O-C)$$. It is formed by dehydration between two carbon atoms of two adjacent monosaccharides. 
    • Water has hydrogen bonding as the hydrogen atoms of one water molecule are attracted towards the oxygen atom of a neighboring water molecule.
    • Amino acids in a protein are linked through peptide bonds whereas ester bond is present in fats .

    So, the correct answer is 'A - Glycosidic, B - Peptide, C - Ester, D - Hydrogen'.
  • Question 6
    1 / -0
    Acetaldehyde can be used for making synthetic:
    Solution
    Acetaldehyde is primarily used as an intermediate in the manufacture of a range of chemicals, perfumes, aniline dyes, plastic and synthetic rubber, etc.
    $$\therefore$$ Answer is option $$B$$ and $$C$$.
  • Question 7
    1 / -0
    The basic chemical building block of natural rubber obtained from trees is:
    Solution
    Isoprene was first isolated by decomposition of natural rubber. About $$95\%$$ isoprene production is used to produce cis-polyisoprene - a synthetic version of natural rubber. Natural rubber consists mainly of poly-cis-isoprene.
    Hence, isoprene is the correct answer.
  • Question 8
    1 / -0
    Orion and Acrilan are fibres of well-known textile materials of the same name. They are copolymers of:
    Solution
    Orlon is also known as polyacrylonitrile hence is the copolymer of acrylonitrile.
    Acrilan is also a copolymer of acrylonitrile.
  • Question 9
    1 / -0
    To solve the problem of looking bald, human hair wigs are worn which are very expensive. Synthetic wigs are made from a copolymer of vinyl chloride and acrylonitrile called:
    Solution
    Hair wigs made of a copolymer of vinyl chloride and acrylonitrile called Dynel or Modacrylic.

  • Question 10
    1 / -0
    The hard, plastic covers of telephones are made of polymers of:
    Solution
    Bakelite is used for making of hard, plastic covers of telephones as it is non-breakable. Bakelite is a thermosetting polymer which once hardened cannot be melted back.
    Bakelite is obtained by the polymerisation of phenol and formaldehyde.

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