Dear Nitin Gupta,
1) polar molecules have some velue of dipole moment
2) non polar molecules have zero dipole moment
3) we can measure degree of polarity. that means if molecule has higher value of dipole moment has greater polarity
4) also we can use it for shape finding
using this we can differentiate polar and non polar molecules.
Please feel free to ask your queries here. We are all IITians and here to help you in your IIT JEE preparation.
All the best.
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