Diamond is a network solid
Option (iii)
Explanation:
- Diamonds are resulted by the formation of strong directional 'covalent bonds' between the adjacent atoms throughout the crystal. It is the hardest substance on Earth which has a high level of melting point.
- It has a structure of tetrahedral. It is used to sharpen hard tools, in the making of dyes and in manufacture of tungsten filaments due to its high melting point.
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