Which one of the following statements is <strong>correct</strong> about diamond and graphite ?
- A. Diamond and graphite have similar physical and chemical properties.
- B. Diamond is hard but graphite is smooth and slippery. ✓
- C. Diamond and graphite are both non-conductors of electricity.
- D. Both diamond and graphite have similar structures.
Correct Answer: B. Diamond is hard but graphite is smooth and slippery.
Explanation
Diamond is extremely hard due to its rigid tetrahedral 3D structure, while graphite is soft, smooth, and slippery because its carbon atoms are arranged in layered hexagonal sheets that can slide over each other.
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