Hardest material so far found is__________________?
Correct answer: B. Diamond
- A. Graphite
- B. Diamond
- C. Carborundum
- D. Pumice stone
Explanation
Diamond is the hardest naturally occurring material because its carbon atoms form a very strong three-dimensional covalent network. Carborundum is also very hard, but it is below diamond on the hardness scale.
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