Diamond is hard because (A) all the four valence electrons are bonded to carbon atoms by covalent bonds (B) it is a giant molecule (C) it is made up of carbon atoms (D) it cannot be burnt

All the four valence electrons are bonded to carbon atoms by covalent bonds

In diamond, each carbon atom is sp3 hybridised and linked to four other carbon atoms tetrahedrally by covalent bonds. Diamond is the hardest substance since the atoms are held firmly by covalent bonds.

Therefore, the correct option is (A)

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