Multiple choice

Which of the following statements is not true about diamond?

  1. It is a good conductor of electricity.

  2. It is the purest form of carbon.

  3. Artificial diamonds can be prepared by subjecting a solution of pure carbon in iron to very high pressures and temperatures.

  4. It is the hardest naturally-occurring substance.
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A Correct answer
Explanation

Diamond is made up of pure carbon. In the structure of diamond, one carbon atom is attached to four other carbon atoms forming covalent bonds. All the electrons of each carbon atom are shared and the octet rule is satisfied. Hence, no free electron is left for the conduction of electricity.

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