Which of the following is a non-polar molecule?

H_{2} O

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C H C l_{3}

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C O

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C H_{4}

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Solution

The correct option is B $C H_{4}$
The degree of polarity of a molecule is expressed in terms of dipole moment.
Dipole moment $=$ charge $\times$ distance
In $C H_{4}$ , the dipole moment is zero as it is tetrahedral in shape & each bond pair is at an equal distance & is symmetrically arranged.
Hence, $C H_{4}$ is non-polar molecule.

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