Q8 of 68 Page 6

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

The ionic solids conduct electricity in molten state as the constituent particles of ionic solid are not free to move in solid state, thus ionic solids are insulators in their solid state. While the ions become free to move in the molten state


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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 sulphide,


graphite, rubidium, argon, silicon carbide.

 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?

 9

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

 10

Give the significance of a ‘lattice point’,