Question
$CO _2$ is non-polar while $SO _2$ is polar, why?
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Answer
In $CO _2$ and $SO _2$ both compounds have polar bond but the geometry of $CO _2$ is linear. Hence due to the moments of both its $C - O$ bonds being in opposite directions, their effect gets cancelled due to which its dipole moment is zero, hence $CO _2$ is non-polar whereas it is not in case of $SO _2$. This happens because the geometry is angular, hence its dipole moment is not zero. Hence it is polar.
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