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The Solid State

Question

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Copper crystallizes in fcc with a unit cell length of 361 pm. What is the radius of copper atom?

108 pm

127 pm

157 pm

181 pm

Solution

B.

127 pm

For space FCC comma square root of 2 straight a end root space equals space 4 straight r straight r space equals space square root of fraction numerator 2 straight a over denominator 4 end fraction end root space equals space fraction numerator square root of 2 space straight x space 361 over denominator 4 end fraction space equals space 127 space pm

Some More Questions From The Solid State Chapter

Classify the following as amorphous or crystalline solids: Polyurethane, naphthalene, benzoic acid, teflon, potassium nitrate, cellophane, polyvinyl chloride, fibre glass, copper.

Why is glass considred a super-cooled liquid?

Refractive index of a solid is observed to have the same value along all directions. Comment on the nature of this solid. Would it show clevage property?

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.

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