Materials and Components
On the basis of the type of chemical bonds, solids may be classified into

Ionic crystal, valence crystals and metals
Ionic and valence crystals
Ionic crystals, valence crystals, metal and vander wall crystals
Ionic crystals

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Materials and Components
With increase in temperature, the electrical conductivity would

Increase in metals but decrease in intrinsic semiconductor
Decrease in metals but increase in intrinsic semiconductor
Decrease in metals as well as in intrinsic semiconductor
Increase in metals as well as in intrinsic semiconductor

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