Unit 4: Structure of Molecules

What is the molecular geometry of a molecule with two bonding pairs and one lone pair around the central atom?

• A) Linear
• B) Trigonal planar
• C) Bent
• D) Tetrahedral

Answer: C) Bent

Which molecule has a bond angle of approximately 180°?

• A) Water (H₂O)
• B) Ammonia (NH₃)
• C) Carbon dioxide (CO₂)
• D) Methane (CH₄)

Answer: C) Carbon dioxide (CO₂)

Which hybridization corresponds to a trigonal bipyramidal molecular geometry?

• A) sp
• B) sp²
• C) sp³
• D) sp³d

Answer: D) sp³d

Which molecule has a tetrahedral molecular geometry with no lone pairs on the central atom?

• A) Water (H₂O)
• B) Ammonia (NH₃)
• C) Methane (CH₄)
• D) Boron trifluoride (BF₃)

Answer: C) Methane (CH₄)

In which molecule is the central atom sp² hybridized?

• A) Ethylene (C₂H₄)
• B) Ethane (C₂H₆)
• C) Acetylene (C₂H₂)
• D) Methane (CH₄)

Answer: A) Ethylene (C₂H₄)

What is the shape of a molecule with two single bonds and two lone pairs around the central atom?

• A) Linear
• B) Trigonal planar
• C) Bent
• D) Tetrahedral

Answer: C) Bent

Which of the following molecules has an octahedral geometry?

• A) Methane (CH₄)
• B) Sulfur hexafluoride (SF₆)
• C) Water (H₂O)
• D) Ammonia (NH₃)

Answer: B) Sulfur hexafluoride (SF₆)

In which molecule does the central atom exhibit sp hybridization?

• A) Carbon dioxide (CO₂)
• B) Water (H₂O)
• C) Ammonia (NH₃)
• D) Methane (CH₄)

Answer: A) Carbon dioxide (CO₂)

What is the bond angle in a molecule with a seesaw geometry?

• A) 90° and 120°
• B) 109.5°
• C) 180°
• D) 120° and 180°

Answer: A) 90° and 120°

Which type of molecular shape is associated with a central atom that has two bonds and two lone pairs?

• A) Trigonal pyramidal
• B) Linear
• C) Bent
• D) Tetrahedral

Answer: C) Bent