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Which of the following is a non-metal but a good conductor of electricity?

Answer and explanation

Correct answer: Graphite

The governing concept is that general classifications have important exceptions. Graphite is an allotrope of carbon, and carbon is a non-metal. In graphite, each carbon atom forms three strong covalent bonds, leaving one electron per atom relatively delocalized across the layered structure. These mobile electrons allow graphite to conduct electricity, even though most non-metals are poor conductors. Sulfur and phosphorus are non-metals but do not normally conduct electricity well, while chlorine is a molecular gaseous non-metal and is also not a good conductor. Therefore option A is the only correct answer.

Related tags

ChemistryAllotropyGraphite-And-ConductivityNature Of MatterSome Basic Concepts Of ChemistryClass 11 Mcq

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