Which of the following molecule is polar?
Correct answer: D. HCl
- A. CCl4
- B. AlCl3
- C. CO2
- D. HCl
Explanation
HCl is polar covalent compound as the chloride ion is more electronegative than hydrogen ion. So chloride ions carry partial negative character while hydrogen carries partial positive character. Covalent character is shown by HCl as the atoms of hydrogen and chlorine share their electrons with each other.
This question appeared on the NUMS 2022 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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