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Question

Which of the following is a non-polar molecule?

A
H2O
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B
CHCl3
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C
CO
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D
CH4
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Solution

The correct option is B CH4
The degree of polarity of a molecule is expressed in terms of dipole moment.
Dipole moment = charge × distance
In CH4, the dipole moment is zero as it is tetrahedral in shape & each bond pair is at an equal distance & is symmetrically arranged.
Hence, CH4 is non-polar molecule.

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