Which of the following ions or molecules has a nonzero dipole moment?

{C O}_{2}

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{N O}_{3}^{-}

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{P O}_{4}^{3 -}

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{S O}_{2}

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{S O}_{4}^{2 -}

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Solution

The correct option is C ${S O}_{2}$
Option D is the correct answer.
Sulphur dioxide is a bent molecule. An image has been attached to make the molecule look clear. The angle between the bonds is about 119 degrees. Oxygen is more electronegative in nature than Suphur, hence $S O_{2}$ has a dipole moment which is towards the oxygen atom.

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