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What are polar molecules ? Give examples...

What are polar molecules ? Give examples.

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In polar molecules, the centers of the positive and negative charges are separated even in the absence of an external electric field. They have a permanent dipole moment.
The net dipole moment is zero in the absence of an external electric field. examples of polar molecules are `H_(2)O, N_(2) O,`HCl, `NH_(3)`.
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