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What is the molecular geometry of ammonia (NH3)?

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Question: What is the molecular geometry of ammonia (NH3)?

Options:

  1. Linear
  2. Trigonal planar
  3. Tetrahedral
  4. Trigonal pyramidal

Correct Answer: Trigonal pyramidal

Solution: 

Ammonia has a trigonal pyramidal geometry due to the presence of a lone pair on nitrogen.

What is the molecular geometry of ammonia (NH3)?

Practice Questions

Q1
What is the molecular geometry of ammonia (NH3)?
  1. Linear
  2. Trigonal planar
  3. Tetrahedral
  4. Trigonal pyramidal

Questions & Step-by-Step Solutions

What is the molecular geometry of ammonia (NH3)?
Correct Answer: Trigonal Pyramidal
  • Step 1: Identify the chemical formula of ammonia, which is NH3.
  • Step 2: Determine the central atom in ammonia, which is nitrogen (N).
  • Step 3: Count the number of hydrogen (H) atoms bonded to nitrogen. There are 3 hydrogen atoms.
  • Step 4: Check for lone pairs on the nitrogen atom. Nitrogen has 1 lone pair.
  • Step 5: Use the VSEPR theory (Valence Shell Electron Pair Repulsion) to predict the shape. The lone pair pushes the hydrogen atoms down.
  • Step 6: Conclude that the arrangement of the 3 hydrogen atoms and 1 lone pair creates a trigonal pyramidal shape.
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