CBSE Class 12 Chemistry Solid State Assignment

CBSE Class 12 Chemistry Solid State Assignment. Students are advised to refer to the attached assignments and practise them regularly. This will help them to identify their weak areas and will help them to score better in examination. Parents should download and give the assignments to their children for practice.
1 Why are solids rigid?
Because the particles have fixed positions and can oscillate only about their mean position only.
2 Why do solids have a definite volume?
The particles of solid have fixed positions and can oscillate only about their mean positions only. That is, solids possess rigidity and hence have definite volume.
3 Why is glass considered a super cooled liquid?
Like liquids, amorphous solids have a tendency to flow, though very slowly.
4 Give the significance of a ‘lattice point’.
It is the constituent particle (atom, ion or molecule) of a regular and repeating pattern of crystalline solid
5 Name the parameters that characterise a unit cell.
A unit cell is characterised by:
(i) its dimensions along the three edges, a, b and c. These edges may or may not be mutually perpendicular.
(ii) angles between the edges, α (between b and c) β (between a and c) and γ (between a and b).
Thus, a unit cell is characterised by six parameters, a, b, c, α, β and γ.
These parameters of a typical unit cell are shown in the fig.
CBSE Class 12 Chemistry Solid State Assignment
6. Distinguish between Face- centred and end-centred unit cells and body - centred unit cells.
A face centered unit cell has one constituent particle present at the centre of each face in addition to corner particles.
An end centered unit cell has one particle each at the centre of any two opposite faces in addition to corner particles.
A body centered unit cell has one particle at the centre of unit cell in addition to corner particles.
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