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The Solid State

Question

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Percentages of free space in cubic close packed structure and in body centred packed structure are respectively

48% and 26%

30% and 26%

26% and 32%

32% and 48%

Solution

C.

26% and 32%

Packing fraction of ccp is 74%
% free space in ccp = 26%
Packing fraction of bcc is 68%
%free space in bcc = 32%

Some More Questions From The Solid State Chapter

Classify the following solids in different categories based on the nature of intermolecular forces operating in them:
Potassium sulphate, tin, benzene, urea, ammonia, water, zinc
sulphate, graphite, rubidium, argon, silicon carbide.

Solid A is a very hard, electrical insulator in solid as well as in molten state and melts at extremely high temperature. What type of solid is it?

Ionic solids conduct electricity in liquid state but not in solid state. Explain.

What type of solids are electrical conductors, malleable and ductile?

Give the significance of a 'lattice point'.

Name the parameters that characterize a unit cell.

Distinguish between Hexagonal and monoclinic unit cells.

Distinguish between Face-centred and end-centred unit cells.

What is the two-dimensional coordination number of a molecule in square close packed layer ?

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