Molecular Orbital Theory Quiz

This Molecular Orbital Theory Quiz is designed to test your understanding of molecular orbitals, bond order, magnetic properties, and electronic configurations as covered in Cambridge A-Level Chemistry.

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1. The bond order of a molecule is given by which formula?

(Number of bonding electrons - Number of anti-bonding electrons) / 2

(Number of anti-bonding electrons - Number of bonding electrons) / 2

(Number of bonding electrons + Number of anti-bonding electrons) / 2

Number of bonding electrons / Number of anti-bonding electrons

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How many molecular orbitals are formed when two atomic orbitals combine?

One

Two

Three

Four

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3. What is the electronic configuration of the O₂ molecule based on molecular orbital theory?

(σ2s)²(σ2s)²(σ2p)²(π2p)⁴(π2p)²

(σ2s)²(σ2s)²(π2p)⁴(σ2p)²(π2p)²

(σ2s)²(σ2s)²(π2p)²(π2p)⁴(σ2p)²

(σ2s)²(σ2s)²(σ2p)²(π2p)²(π2p)²

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4. According to molecular orbital theory, which molecule is paramagnetic?

N₂

O₂

H₂

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5. What is the bond order of N₂?

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6. Which of the following molecules has a bond order of 0?

H₂

He₂

O₂

Li₂

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7. Which of the following molecular orbitals has the highest energy?

σ2s

σ*2s

π2p

σ*2p

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8. The HOMO (highest occupied molecular orbital) in O₂ is:

σ2p

π2p

π*2p

σ2s

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9. Which diatomic species has the highest bond order?

N₂⁺

O₂

B₂

C₂

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10. What is the bond order of O₂²⁻ (peroxide ion)?

1.5

2.5

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11. Which of the following molecules has unpaired electrons?

B₂

H₂

Li₂

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12. Which molecular orbital has the most nodal planes?

σ2s

π2p

σ*2s

σ*2p

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13. How does bond order affect bond length?

Higher bond order means longer bond length.

Higher bond order means shorter bond length.

Bond order has no effect on bond length.

Bond order and bond length are inversely related but only for diatomic molecules.

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14. What is the magnetic behavior of F₂?

Diamagnetic

Paramagnetic

Ferromagnetic

Superparamagnetic

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15. Which of the following species is isoelectronic to O₂?

N₂

F₂

O₂²⁻

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16. In which of the following molecules does the π2p orbital fill before σ2p?

O₂

N₂

F₂

Ne₂

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17.

Which statement about anti-bonding orbitals is correct?

They increase bond stability.

They decrease bond stability.

They have lower energy than bonding orbitals.

They contain electrons only in stable molecules.

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What to Expect in the Quiz

Conceptual Questions: Assess your understanding of bonding, anti-bonding, and non-bonding orbitals.
Calculations: Determine bond order and magnetic properties of various diatomic molecules.
Electronic Configurations: Identify correct molecular orbital diagrams and electron arrangements.
Comparative Analysis: Analyze stability, bond length, and energy levels of molecular species.