Unit 4: Structure of Molecules

Which molecule has a central atom with sp³ hybridization and a trigonal pyramidal shape?

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

Answer: C) Ammonia (NH₃)

What type of bond is present in an oxygen molecule (O₂)?

• A) Single bond
• B) Double bond
• C) Triple bond
• D) Quadruple bond

Answer: B) Double bond

Which of the following molecules has a seesaw shape?

• A) SF₆
• B) PCl₅
• C) ClF₃
• D) H₂O

Answer: C) ClF₃

Which molecule has a bond angle of approximately 120°?

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

Answer: C) Boron trifluoride (BF₃)

Which molecule has a central atom with sp hybridization and a linear shape?

• A) Acetylene (C₂H₂)
• B) Water (H₂O)
• C) Methane (CH₄)
• D) Ammonia (NH₃)

Answer: A) Acetylene (C₂H₂)

What is the shape of a molecule with a central atom having three bonding pairs and no lone pairs?

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

Answer: A) Trigonal planar

Which of the following molecules has a central atom with sp³d hybridization?

• A) Methane (CH₄)
• B) Phosphorus trifluoride (PF₃)
• C) Phosphorus pentachloride (PCl₅)
• D) Ammonia (NH₃)

Answer: C) Phosphorus pentachloride (PCl₅)

In which molecule is the central atom sp³d² hybridized?

• A) Water (H₂O)
• B) Carbon dioxide (CO₂)
• C) Chlorine trifluoride (ClF₃)
• D) Sulfur hexafluoride (SF₆)

Answer: D) Sulfur hexafluoride (SF₆)

What is the bond angle in a molecule with an octahedral geometry?

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

Answer: A) 90°

Which molecule has a central atom with sp³ hybridization and a tetrahedral geometry?

• A) Methane (CH₄)
• B) Ethylene (C₂H₄)
• C) Water (H₂O)
• D) Carbon dioxide (CO₂)

Answer: A) Methane (CH₄)