Which one is non-polar but contains polar bonds:
Correct answer: D. CO2
- A. HCl
- B. HF
- C. H2O
- D. CO2
Explanation
CO2 is the correct answer because even though it contains polar bonds between C and O, its linear molecular geometry results in the dipoles cancelling out, making the molecule non-polar overall. HCl, HF, and H2O are polar molecules with polar bonds due to the electronegativity differences between the atoms.
This question appeared on the ETEA MDCAT 2006 paper, which you can sit online with every answer explained.
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About Dipole Moment
Dipole moment measures the separation of positive and negative charge in a bond or molecule, with magnitude related to charge and distance, μ = q r. Questions distinguish polar bonds from polar molecules by considering bond direction, molecular geometry and whether individual bond moments cancel through symmetry.
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