Question 1

Which statement best describes the concept of orbital overlap in valence bond theory?

Accepted Answer

A covalent bond forms when atomic orbitals from two atoms overlap and share electrons.

Question 2

What is the bond angle expected in a molecule with sp\^3 hybridization?

Accepted Answer

$$109.5^\circ$$

Question 3

Which of the following molecules contains a carbon atom with sp\^2 hybridization?

Accepted Answer

Ethene ($$C_2H_4)$$

Question 4

In the context of valence bond theory, what is a sigma ($$\sigma) $$bond?

Accepted Answer

A bond formed by the end-to-end overlap of atomic orbitals along the internuclear axis.

Question 5

Which hybridization is present in the central carbon atom of $$CO_2$$?

Accepted Answer

sp

Question 6

A molecule of ethyne ($$C_2H_2) $$contains which types of bonds between the two carbon atoms?

Accepted Answer

One sigma and two pi bonds

Question 7

Which of the following best explains why the bond angle in water ($$H_2O) is $$less than the ideal tetrahedral angle?

Accepted Answer

The presence of lone pairs on oxygen causes greater repulsion than bonding pairs.

Question 8

What is the main difference between a sigma ($$\sigma) $$bond and a pi ($$\pi) $$bond?

Accepted Answer

Sigma bonds are stronger and result from end-to-end overlap, while pi bonds are weaker and result from side-to-side overlap.

Question 9

Which of the following molecules is nonpolar?

Accepted Answer

$$CO_2$$

Question 10

How many sigma and pi bonds are present in the molecule $$C_2H_4 ($$ethene)?

Accepted Answer

5 sigma, 1 pi

Question 11

Which statement about hybrid orbitals is correct?

Accepted Answer

Hybrid orbitals are formed by combining atomic orbitals on the same atom.

Question 12

What is the expected geometry of a molecule with sp\^2 hybridization?

Accepted Answer

Trigonal planar

Question 13

Which of the following best describes the bonding in $$NH_3 ($$ammonia)?

Accepted Answer

The nitrogen atom is sp\^3 hybridized and forms three sigma bonds and one lone pair.

Question 14

Which of the following molecules contains a triple bond?

Accepted Answer

$$C_2H_2$$

Question 15

What is the hybridization of the central atom in $$BF_3$$?

Accepted Answer

sp\^2

Question 16

Which of the following statements about the VSEPR theory is correct?

Accepted Answer

VSEPR theory predicts the geometry of molecules based on electron pair repulsion.

Question 17

A molecule has the formula $$AX_2$$ and a linear geometry. What is the hybridization of the central atom?

Accepted Answer

sp

Question 18

Which of the following is a consequence of the Pauli exclusion principle in the orbital overlap model?

Accepted Answer

No two electrons in a molecule can have the same set of quantum numbers.

Question 19

Which molecule has a dipole moment due to its molecular geometry?

Accepted Answer

$$NH_3$$

Question 20

In the context of real-world applications, why is the concept of hybridization important in organic chemistry?

Accepted Answer

It helps predict the shapes and reactivity of organic molecules, such as drugs and polymers.

Valence Bond Theory and Hybridization in Chemical Bonding

Study Guide - Practice Questions