Solid A is a very hard electrical insulator in solids as well as in molten state and melts at extremely high temperature. what type of solid is it ?

Answer :

The given properties are the properties of a covalent or network solid.Therefore the given solid is a covalent or network solid.Examples of such solids include diamond(C) and quartz(SiO2).
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I think that Solid A is Diamond as it is a very hard substance and an electric insulator

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