What is Hybridization ? Explain

What is Hybridization ? Explain.What will be the state of the hybridization of the central atom in each of the following species.

Hybridization is defined as the mixing of the atomic orbitals belonging to the same atom but having slightly different energies so that a redistribution of energy takes place between them resulting in the formation of new orbitals of equal energies and identical shapes. The new orbitals thus formed are known as hybrid orbitals.