Which among the following statements is <strong>NOT</strong> correct with respect to allotropes of Carbon ?
- A. Graphite is a good conductor of electricity.
- B. Diamond is the hardest substance known.
- C. Fullerene is one of the allotropes of carbon.
- D. Next to diamond, graphite is the second hardest known substance. ✓
Correct Answer: D. Next to diamond, graphite is the second hardest known substance.
Explanation
Graphite is extremely soft and slippery; it is not the second hardest known substance.
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