Question 1

According to Valence Bond Theory, what is the primary reason that central atoms hybridize their orbitals?

Accepted Answer

To form bonds with optimal geometry and strength by combining atomic orbitals

Question 2

If the central atom in a molecule is $$sp^3$$ hybridized, what is the expected geometry around that atom?

Accepted Answer

Tetrahedral

Question 3

Which hybridization is expected for the central atom in $$SF_2$$?

Accepted Answer

$$sp^3$$

Question 4

What is the bond order of $$H_2$$ according to Molecular Orbital Theory?

Accepted Answer

$$1$$

Question 5

Based on the Lewis structure and MO diagram, what are the magnetic properties of $$O_2$$?

Accepted Answer

Paramagnetic; bond order = 2.0

Question 6

Which of the following molecules is paramagnetic?

Accepted Answer

Liquid oxygen

Question 7

What is the hybridization of the central atom in $$SeF_4$$?

Accepted Answer

$$sp^3d$

Question 8

In the molecule $$C_2H_4 ($$ethene), what is the hybridization of each carbon atom?

Accepted Answer

$$sp^2$$

Question 9

Which of the following best describes a double bond in terms of orbital overlap?

Accepted Answer

One sigma bond and one pi bond

Question 10

Which type of hybridization leads to a trigonal planar geometry?

Accepted Answer

$$sp^2$$

Question 11

What is the bond angle expected in a molecule with $$sp^3$$ hybridization, such as methane ($$CH_4$$)?

Accepted Answer

$$109.5^	ext{o}$$

Question 12

Which hybridization is associated with a linear molecular geometry?

Accepted Answer

$$sp$$

Question 13

Which of the following statements about diamagnetism is correct?

Accepted Answer

Diamagnetic substances have all electrons paired and are repelled by a magnetic field

Question 14

Which molecule cannot exist according to its MO diagram?

Accepted Answer

$$He_2$$

Question 15

In the context of MO theory, what does LCAO stand for?

Accepted Answer

Linear Combination of Atomic Orbitals

Question 16

Which hybridization is required for an expanded octet with six electron domains, such as in $$SF_6$$?

Accepted Answer

$$sp^3d^2$

Question 17

What is the bond order of $$N_2$$ according to its MO diagram?

Accepted Answer

$$3.0$$

Question 18

Which of the following best describes the difference between sigma ($$\sigma) $$and pi ($$\pi) $$bonds?

Accepted Answer

Sigma bonds result from end-to-end overlap along the internuclear axis; pi bonds from side-to-side overlap above and below the axis

Question 19

Which of the following molecules is expected to be polar based on its geometry and hybridization?

Accepted Answer

$$H_2O ($$bent, $$sp^3)$$

Question 20

Which of the following is true about ferromagnetism?

Accepted Answer

Ferromagnetic substances have atomic spins aligned

Valence Bond Theory and Hybridization: Structured Study Notes

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