Single correct option
Graphite, unlike diamond, conducts electricity because
- A. it contains free ions
- B. it has a tetrahedral structure
- C. it is a compound of carbon and hydrogen
- D. each carbon atom has one free valence electron after bonding with three others
Show answer and solution
Answer: (D) each carbon atom has one free valence electron after bonding with three others
In graphite each carbon is covalently bonded to three others in hexagonal layers, which leaves one electron per atom delocalised and free to move. In diamond all four valence electrons are in bonds. Graphite is also pure carbon and has no ions.
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