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Which of the following is used for making cutting tools due to its extreme hardness?
A{'text': 'Graphite', 'label': 'A'}
B{'text': 'Wax', 'label': 'B'}
C{'text': 'Coal', 'label': 'C'}
D{'text': 'Diamond', 'label': 'D'}
Answer & Solution
Correct answer: D. {'text': 'Diamond', 'label': 'D'}
1. Diamond is the hardest known natural substance.
2. Every carbon atom in diamond is bonded to 4 others in a rigid 3-D tetrahedral network.
3. This structure gives diamond extreme hardness.
4. It is used in cutting, grinding and drilling tools industrially.
_Source: NCERT Class 10 Science, Ch 4 "Carbon and its Compounds", §4.1_
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