alleryWhich of the following is used for making cutting tools due to its extreme hardness?
AGraphite
BWax
CCoal
DDiamond
Answer & Solution
Correct answer: D. Diamond
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: syllabus Science, Ch 4 "Carbon and its Compounds", §4.1_
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