Polymer
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Questions and Answers

What is the effect of long exposure to air and sunlight on plastic articles containing chlorinated paraffin wax?

  • They become hard and brittle (correct)
  • They become soft and flexible
  • They remain unchanged
  • They become more soluble in organic solvents

    • Which type of polymers are formed by addition reaction?

  • Condensation polymers
  • Thermoplastic polymers
  • Thermosetting polymers
  • Addition polymers (correct)

    • What is a characteristic of thermoplastic polymers?

  • They become hard on heating
  • They are insoluble in organic solvents
  • They have three-dimensional cross-linked structures
  • They can be remoulded and reshaped (correct)

    • What is the molecular mass of condensation polymers?

    <p>Not a whole number multiple of the monomer units</p> Signup and view all the answers

    What is the characteristic of thermosetting polymers in terms of solubility?

    <p>They are insoluble in organic solvents</p> Signup and view all the answers

    What is the reason for thermoplastics becoming brittle on long exposure to air and sunlight?

    <p>Due to the evaporation of plasticizer with time</p> Signup and view all the answers

    What is the characteristic of high density polyethene?

    <p>It has high tensile strength in one direction and low tensile strength at right angle to it</p> Signup and view all the answers

    What is the name of the polymer obtained by condensation copolymerization of terephthalic acid with 1, 4-diaminobenzene?

    <p>Kevlar</p> Signup and view all the answers

    What type of polymer is used to make baby-feed bottles and fridge containers?

    <p>Thermoplastics</p> Signup and view all the answers

    What is the characteristic of carry bags made of low density polyethene?

    <p>They are soft and have same tensile strength in all directions</p> Signup and view all the answers

    What is the primary reason for the softening of thermoplastic polymers when heated?

    <p>Absence of cross links between polymer chains</p> Signup and view all the answers

    What is the characteristic of thermosetting polymers when heated?

    <p>They undergo permanent change and become hard and infusible</p> Signup and view all the answers

    What is the role of plasticizers in polymers?

    <p>To reduce the interparticle forces between polymer molecules</p> Signup and view all the answers

    What is the characteristic of thermoplastic polymers?

    <p>They become soft and flexible when heated</p> Signup and view all the answers

    Why do thermosetting polymers become hard and infusible when heated?

    <p>Due to the presence of cross links between polymer chains</p> Signup and view all the answers

    What type of polymer is formed when a single type of monomer is used in the polymerisation process?

    <p>Homopolymer</p> Signup and view all the answers

    Which of the following copolymers is formed by the polymerisation of vinyl chloride with vinylidene chloride?

    <p>Saran</p> Signup and view all the answers

    What is the characteristic of a copolymer formed by the polymerisation of two or more different monomers?

    <p>It has different properties than the corresponding homopolymer</p> Signup and view all the answers

    What is the result of copolymerisation of monomer mixtures?

    <p>Formation of a copolymer with different properties than the corresponding homopolymer</p> Signup and view all the answers

    What is an example of a homopolymer formed from a single type of monomer?

    <p>Polythene</p> Signup and view all the answers

    What is the main difference between addition polymers and condensation polymers?

    <p>The elimination of byproduct molecules</p> Signup and view all the answers

    Which type of polymer is characterized by a three-dimensional network structure?

    <p>Cross-linked polymers</p> Signup and view all the answers

    What is the likely reason for the low tensile strength of branched chain polymers?

    <p>Irregular packing of the polymer chains</p> Signup and view all the answers

    Which of the following polymers is an example of a condensation polymer?

    <p>Nylon-66</p> Signup and view all the answers

    What is the typical characteristic of branched chain polymers?

    <p>Low density and boiling point</p> Signup and view all the answers

    What type of intermolecular forces are present in elastomers?

    <p>Weak intermolecular forces</p> Signup and view all the answers

    What is a characteristic of fibres?

    <p>Strong intermolecular forces and high tensile strength</p> Signup and view all the answers

    What happens to thermoplastics when heated?

    <p>They can be softened and reshaped</p> Signup and view all the answers

    What is a key difference between elastomers and fibres?

    <p>Elastomers have weak intermolecular forces, while fibres have strong intermolecular forces</p> Signup and view all the answers

    What is a characteristic of thermoplastic polymers?

    <p>They can be softened and reshaped multiple times</p> Signup and view all the answers

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