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 Study Material and Notes, NEET 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 ) PDF

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

13.

Sigma (σ) molecular orbitals are:

Asymmetrical around the bond axis

Symmetrical around the bond axis

Always have nodes at the nucleus

Always antibonding

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14.

Pi (π) molecular orbitals are:

Higher in energy than σ* always

Symmetrical around the bond axis

Not symmetrical around the bond axis (have positive lobe above and negative lobe below)

Identical to sigma orbitals

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15.

Linear combination of 1s atomic orbitals of two atoms gives:

Only one molecular orbital

δ1s molecular orbital

σ1s and σ*1s molecular orbitals

π1s and π*1s molecular orbitals

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16.

When two 2pz atomic orbitals combine along the z-axis (bond axis), the molecular orbitals formed are:

δ2pz orbital only

Hybrid orbitals

σ2pz and σ*2pz

π2pz and π*2pz

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17.

When 2px atomic orbitals combine (with bond axis being z), the molecular orbitals formed are:

σ2px and σ*2px

π2px and π*2px

δ2px only

Cannot combine

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18.

Which molecular orbitals are degenerate (equal in energy)?

π2px and π2py (and similarly π*2px and π*2py)

σ2s and π2px

σ1s and σ2s

σ2pz and σ*2pz

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