Question

Diamond is hard because

• A. All the four valence electron are bonded to each carbon atom by covalent bond
• B. It is a small molecule
• C. It is made up of carbon atoms
• D. It cannot by burnt

Answer 1

The correct option is A All the four valence electron are bonded to each carbon atom by covalent bond

In diamond, each carbon atom is in $s{p}^3$ hybridized state and linked to four other carbon atoms tetrahedrally by covalent bonds. As the atoms are held firmly by strong covalent bonds. So diamond is hardest substance.

Hence , option A is correct.