Question

Why does a diamond change directly from a solid state to a gaseous state?

Answer 1

Answer : A diamond is a network solid formed from carbon.

Explanation :

Diamond changes directly into gaseous state from solid state because it undergoes sublimation. As the structure of the diamond contains a network of solid which is formed from carbon atoms, which makes diamond a strongest solid which does not undergoes melting process to form liquid state instead it undergoes phase transition directly from solid to gaseous state. It has cubic crystal structure in which it has a repeating pattern of 8 atoms.

Answer 2

The choices can be found elsewhere and as follows:

A diamond is comprised of only ionic bonds.
A diamond is comprised of interspersed ionic and covalent bonds.
A diamond is formed from hydrogen bonds.
A diamond is hexagonal.
A diamond is a network solid formed from carbon.

I think the correct answer is the last option. A diamond is a network solid formed from carbon.

Hope this helps.