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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.


Molecular solids: water, argon.
Ionic solids: potassium sulphate, zinc sulphate.
Metallic solids: tin, rubidium.
Covalent or network: benzene, urea, ammonia, graphite, silicon carbide.

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

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?

Give the significance of a 'lattice point'.

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

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