Trends in Non-Metallic Character of Elements
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Questions and Answers

What is the main factor that determines the nature of a silicone polymer?

  • Length of the alkyl group
  • Thermal conductivity
  • Extent of cross-linking (correct)
  • Presence of oxygen atoms

    • Which type of silicones are bridged together by methylene or similar groups?

  • Cross-linked silicones
  • Linear silicones
  • Silicone resins (correct)
  • Cyclic silicones

    • How are cyclic silicones obtained?

  • By hydrolysis of R2SiCl2 (correct)
  • By blending with organic resins
  • By the condensation of dialkyl or diaryl silicon chlorides
  • By hydrolysis of RSiCl3

    • What property makes all silicones water repellent?

    <p>Organic side groups surrounding the silicon</p> Signup and view all the answers

    Which type of silicones are obtained by blending with organic resins such as acrylic esters?

    <p>Silicone resins</p> Signup and view all the answers

    What determines whether silicone polymers range from oily liquids to rubber-like solids?

    <p>Extent of cross-linking</p> Signup and view all the answers

    What makes the viscosity of silicone oil remain constant and not change with temperature?

    <p>'Oily' nature of lower silicones</p> Signup and view all the answers

    Which type of silicones are obtained by the hydrolysis and subsequent condensation of dialkyl or diaryl silicon chlorides?

    <p>'Linear' silicones</p> Signup and view all the answers

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