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The Solid State

Short Answer Type

1. Why are solids rigid?

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2. Why do solids have a definite volume?

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

Amorphous solids: Polyurethane, teflon, cellophane, polyvinyal chloride, fibre glass.
Crystalline solids: naphthlene, benzoic acid, potassium nitrate, copper.

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4. Why is glass considred a super-cooled liquid?

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5. 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?

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6. 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.

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7. 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?

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

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

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10. Give the significance of a 'lattice point'.

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