Chemistry the solid state NCERT questions

    • September 12, 2020
    • Rajiv Sharma
    • 0
    Latest Questions Update › Category: Chemistry › Chemistry the solid state NCERT questions
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    Rajiv Sharma asked 4 years ago
    1. Why are solids rigid? Why do solids have a definite volume?
    2. The following solids in different categories based on the nature of inter molecular forces operating in them:
      • Urea
      • Graphite
      • Rubidium
      • Tin
      • Benzene
      • Ammonia
      • Water
      • Zinc sulphide
      • Argon
      • Silicon carbide
      • Potassium sulphate
    3. Name the parameters that characterise a unit cell.
    1 Answers
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    Education Desk Staff answered 4 years ago
    Question : Why are solids rigid?
    Answer
    The constituent particles in solids have fixed positions and can oscillate about their mean positions. Hence, they are rigid.
    The constituent particles of a solid have fixed positions and are not free to move about, i.e., they possess rigidity. That is why they have definite volume.

    Question: Name the parameters that characterise a unit cell.
    Answer
    A unit cell is characterised by following parameters:
    The angles between the edges: α (between b and c); β (between a and c) and γ (between a and b)
    The dimensions of unit cell along three edges: a, b and c.

    Question: The following solids in different categories based on the nature of inter molecular forces operating in them:
    Answer
    Urea : Molecular (polar)
    Graphite : Covalent
    Rubidium : Metallic
    Tin : Metallic
    Benzene : Molecular (non-polar)
    Ammonia : Molecular (H-bonded)
    Water : Molecular (H-bonded)
    Zinc sulphide : Ionic
    Argon : Molecular (non-polar)
    Silicon carbide : Covalent
    Potassium sulphate : Ionic

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