AP Chemistry ---VSEPR

1. Which of the following has a bent (V-shaped) molecular geometry (structure) with a bond angle of approximately 120^◦?

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• 
• 
• 

What is the molecular geometry in the above structure?

• tetrahedral

• trigonal planar

• trigonal pyramidal

• octahedral

What is the bond angle in H₂S molecule?

• 107^◦

• 104.5^◦

• 180^◦

• 120^◦

Why is the bond angle in NH₃ molecule is smaller than that in CH₄ molecule?

• Among the four electron pairs around the central atom N in NH₃

  molecule, there are two lone pairs which require more space than bonding pairs and tend to compress the angles between the bonding pairs.

• Among the four electron pairs around the central atom N in NH₃

  molecule, there is one lone pair which requires more space than a bonding pair and tends to compress the angles between the bonding pairs.

• Among the four electron pairs around the central atom N in NH₃

  molecule, there is one lone pair which requires less space than bonding pairs and tend to increase the angles between the bonding pairs.

• In reality, bond angle in NH₃ molecule is larger than that in CH₄ molecule.