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

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Solution

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 $d i a m o n d (C)$ and quartz $(S i O_{2})$ .

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

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).

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 $d i a m o n d (C)$ and quartz $(S i O_{2})$ .