Molecular Orbital Theory (Its Important features. LCAOs, types of molecular orbitals (bonding, antibonding), sigma and pi-bonds, molecular orbital electronic configurations of homonuclear diatomic molecules, the concept of bond order, bond length, and bond energy ) NEET Questions

Physical Chemistry - Chemical Bonding and Molecular Structure

Molecular Orbital Theory (Its Important features. LCAOs, types of molecular orbitals (bonding, antibonding), sigma and pi-bonds, molecular orbital electronic configurations of homonuclear diatomic molecules, the concept of bond order, bond length, and bond energy ) MCQ Questions


1.
Molecular Orbital Theory (MOT) was developed by:
A.
Heitler and London
B.
F. Hund and R.S. Mulliken
C.
Lewis and Langmuir
D.
Pauling and Slater
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ANSWER :
B. F. Hund and R.S. Mulliken
2.
According to MOT, electrons in a molecule are present in:
A.
Atomic orbitals of individual atoms
B.
Lone pair orbitals only
C.
Hybrid orbitals only
D.
Molecular orbitals that are associated with the entire molecule
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ANSWER :
D. Molecular orbitals that are associated with the entire molecule
3.
Which of the following is NOT a salient feature of MOT?
A.
The atomic orbitals of comparable energies and proper symmetry combine to form molecular orbitals
B.
The number of molecular orbitals formed equals the number of combining atomic orbitals
C.
An atomic orbital is polycentric while a molecular orbital is monocentric
D.
An electron in a molecular orbital is influenced by two or more nuclei
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ANSWER :
C. An atomic orbital is polycentric while a molecular orbital is monocentric
4.
When two atomic orbitals combine to form molecular orbitals, the number of molecular orbitals formed is:
A.
Always 1
B.
Equal to twice the number of atomic orbitals
C.
Equal to the number of combining atomic orbitals
D.
Always 2
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ANSWER :
C. Equal to the number of combining atomic orbitals
5.
Bonding molecular orbital is formed by:
A.
Addition of atomic orbital wave functions (constructive interference)
B.
Random combination
C.
Multiplication of wave functions
D.
Subtraction of atomic orbital wave functions
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ANSWER :
A. Addition of atomic orbital wave functions (constructive interference)
6.
Antibonding molecular orbital is formed by:
A.
Subtraction of atomic orbital wave functions (destructive interference)
B.
Random mixing
C.
Addition of wave functions
D.
Doubling the wave function
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ANSWER :
A. Subtraction of atomic orbital wave functions (destructive interference)