- Why are solids rigid? Why do solids have a definite volume?
- The following solids in different categories based on the nature of inter molecular forces operating in them:
- Zinc sulphide
- Silicon carbide
- Potassium sulphate
- Name the parameters that characterise a unit cell.
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.
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:
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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