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The Solid State

Question
CBSEENCH12011133
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Which of the following statements about the interstitial compounds is incorrect?

  • They retain metallic conductivity

  • They are chemically reactive

  • They are much harder than the pure metal

  • They have higher melting points than the pure metal

Solution

B.

They are chemically reactive

Interstitial compounds are obtained when small atoms like H, B, C, resemebleN etc.fit into the lattice etc. fit into the lattice of other elements. These retain metallic conductivity resemble their parent metal in chemical properties (reactivity)but differ in physical properties like hardness, melting point etc.

Some More Questions From The Solid State Chapter

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.

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

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