Which of the following molecules is **non-polar** (has zero permanent dipole moment)?
AH₂O
BNH₃
CHCl
DCO₂
Answer & Solution
Correct answer: D. CO₂
CO₂ is linear (O=C=O); the two C=O bond dipoles cancel by symmetry, so net $\vec p = 0$. HCl, H₂O (bent, ~105°) and NH₃ are polar with permanent dipole moments and behave as polar dielectrics.
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