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Solid A is a very hard electrical insula...

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

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Covalent or network solid like quartz `(SiO_2)` or SiC.
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Solid A is very hard electrical insulator in solid as well as in molten state and melts at an extremely high temperature. What type of solid is it?

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