Which one shows high %age of the ionic character ?
Correct answer: B. HF
- A. H2O
- B. HF
- C. HCI
- D. HBr
Explanation
HF has the greatest electronegativity difference among these hydrogen compounds, so its H-F bond has the highest percentage ionic character. A student may choose H2O because it has two polar O-H bonds, but the question compares ionic character of the individual bonds, not the number of bonds in the molecule.
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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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