Question

The melting point of diamond is very high since the bonding in it is:
A. Strong covalent bond
B. Ionic bond
C. Hydrogen bonds
D. Coordinate covalent bond

Answer 1

Hint: In diamond each carbon atom is bonded to four other carbon atoms. A lot of energy is needed to separate the atoms in diamond. Pick the option which satisfies the criteria of most strong bonds.

Complete step by step answer:

Diamond, a mineral composed of pure carbon. It is the hardest naturally occurring substance known; it is also the most popular gemstone. Because of their extreme hardness, diamonds have a number of important industrial applications.
Diamond has a polymeric structure with multiple C-C single covalent bonds. Each carbon atom is covalently bonded to four other carbon atoms. The bond energy of each C-C single bond is very high.
To melt diamond, these bonds are to be broken, to increase the intermolecular separation. Because covalent bonds are strong, diamond contains many covalent bonds. As high temperatures are required to break such strong bonds, diamond melts at a very high temperature.

Hence, the correct option is A.

Additional information:
Features of covalent bonds -
Covalent bonding does not result in the formation of new electrons. The bond only pairs them.
A covalent bond normally contains the energy of about ~80 kilocalories per mole (kcal/mol).
Covalent bonds rarely break spontaneously after it is formed.
Covalent bonds are directional where the atoms that are bonded showcase specific orientations relative to one another.

Note: A covalent bond is formed by equal sharing of electrons from both the participating atoms. The pair of electrons participating in this type of bonding is called a shared pair or bonding pair.
The covalent bonds are also termed as molecular bonds.