Final answer:
The total number of molecular orbitals formed doesn't always equal the number of atomic orbitals in the set. This statement is true.
Step-by-step explanation:
The statement that the total number of molecular orbitals formed doesn't always equal the number of atomic orbitals in the set is True.
When two atomic orbitals combine, they can form both bonding and antibonding molecular orbitals. The number of molecular orbitals formed will depend on the overlap and combination of the atomic orbitals.
For example, when two atomic s orbitals overlap, they can form a bonding molecular orbital, an antibonding molecular orbital, and a non-bonding molecular orbital. So, the total number of molecular orbitals formed can be different from the number of atomic orbitals in the set.