Question:
A hard substance melts at high temperature and is an insulator in both solid and in molten state. This solid is most likely to be a/an :
A hard substance melts at high temperature and is an insulator in both solid and in molten state. This solid is most likely to be a/an :
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Graphite is a notable exception; it is a covalent solid that conducts electricity due to its layered structure and delocalized electrons.
Updated On: Jan 12, 2026
- Ionic solid
- Covalent solid
- Metallic solid
- Molecular solid
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The Correct Option is B
Solution and Explanation
Step 1: Analyze the properties of different solids.
Ionic solids are insulators in solid state but conductors in molten state due to free ions.
Metallic solids are conductors in both states.
Molecular solids are soft and have low melting points.
Step 2: Covalent (Network) solids like Diamond or \(SiO_2\) are extremely hard, have very high melting points, and do not have free electrons or ions, making them insulators in both solid and molten states.
Ionic solids are insulators in solid state but conductors in molten state due to free ions.
Metallic solids are conductors in both states.
Molecular solids are soft and have low melting points.
Step 2: Covalent (Network) solids like Diamond or \(SiO_2\) are extremely hard, have very high melting points, and do not have free electrons or ions, making them insulators in both solid and molten states.
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