Dipole Moment
Which of the following molecules has zero dipole moment?
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About This Question
- Subject
- chemistry
- Chapter
- chemical bonding and molecular structure
- Topic
- dipole moment
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
CO₂
The Dipole Moment (μ) is a vector quantity. A molecule has zero net dipole moment if its individual bond dipoles cancel out due to symmetry.
- CO2: Linear structure (O=C=O). The two C=O bond dipoles are equal in magnitude but act in exactly opposite directions (180∘). Resultant μ=0.
- H2O: Bent shape. Bond dipoles don't cancel. μ=0.
- NH3: Trigonal pyramidal shape. Resultant μ=0.
- HCl: Polar diatomic molecule. μ=0.
This easy difficulty chemistry question is from the chapter chemical bonding and molecular structure, covering the topic of dipole moment. It appeared in the 2025 exam.
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