Which one of the following has polar covalent bond ?
Correct answer: A. HF
- A. HF
- B. CH4
- C. H2
- D. N2
Explanation
HF has a polar covalent bond because fluorine is much more electronegative than hydrogen, so the shared electrons are attracted unequally. H2 and N2 have identical atoms and nonpolar bonds, while CH4 has nearly nonpolar C-H bonds in the usual introductory treatment. The likely mistake is choosing CH4 because it contains different elements, but its C-H electronegativity difference is small.
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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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