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Polymers Test - 34

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Polymers Test - 34
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  • Question 1
    1 / -0
    Bakelite is a polymer of
    Solution
    Bakelite is a cross-linked condensation polymer of phenol $$(C_{6}H_{5} - OH)$$ and formaldehyde $$(HCHO)$$. It is thermosetting plastic used for making electrical switches and switch boards.
  • Question 2
    1 / -0
    The IUPAC name for Teflon is:
    Solution
    The IUPAC name of Teflon is Polytetrafluoroethylene (PTFE) which is a synthetic fluoropolymer of tetrafluoroethylene.  $$ (C_2F_4)_n$$. 

  • Question 3
    1 / -0
    Select a copolymer from the following:
    Solution

    When two or more polymers having different monomeric units polymerize, then the polymer formed is known as copolymer. PHBV is a copolymer of 3-hydroxybutanoic acid and 3-hydroxypentanoic acid.

  • Question 4
    1 / -0
    Polymer used to make gasket of pressure cooker is:
    Solution
    Polymer used to make gasket of pressure cooker is teflon. Teflon is formed by free radical vinyl polymerisation of the monomer tetrafluoroethylene.
  • Question 5
    1 / -0
    Super glue or crazy glue is:
    Solution
    Super glue is poly(methyl $$\alpha$$-cyanoacrylate).

  • Question 6
    1 / -0
    Which polymer is used in non-stick cooking vessels?
    Solution
    Teflon is used in the preparation of non-stick cooking vessels and as an insulators.
  • Question 7
    1 / -0
    Polypropylene can be obtained by polymerisation of :
    Solution
    $$nCH_3-HC=CH_2\longrightarrow \underset{\text{porypropylene}}{(-CH_2-\underset{CH_3}{\underset{|}{C}H}-)_n}$$

    Hence, polypropylene must have its monomeric unit derived from propylene (3 carbon unit).

    Hence the correct option is A.
  • Question 8
    1 / -0
    The monomer unit for the given compound is:

    Solution
    The monomer is 2-methylpropene. It polymerises by addition polymerisation.

  • Question 9
    1 / -0
    Which polymer among the following polymers does NOT soften on heating?
    Solution
    Thermoplastics:
    A plastic material, which can be repeatedly melted-molded again and again by simple heating, is called a thermoplastic. Thermoplastics become soft and moldable on heating. They can then be recast in different shapes and cooled. On cooling the thermoplastic material hardens.

    Polyethylene, polystyrene and PVC are examples.

    Thermosetting plastics:
    A plastic material, which cannot be repeatedly melted-molded again, is called a thermosetting plastic.thermosetting plastics do not become soft on heating and they do not change their shape on heating.
    Bakelite is one example of a thermosetting plastic.
  • Question 10
    1 / -0
    Which of the following statements is incorrect?
    Solution
    Mixture of styrene and methyl methacrylate can form a copolymer and not an ionic addition polymer. Hence, the statement in option  is incorrect.
    Other statements are correct.
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