Which molecule does not have net zero dipole moment?

$C O_{2}$

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$H_{2}$

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$C l_{2}$

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$H_{2} O$

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Solution

The correct option is D
$H_{2} O$

$H_{2}$ and $C l_{2}$ are covalent molecules made up of same elements. This, they will not have any net dipole moment.

$C O_{2}$ is a linear symmetrical molecule. Thus, it will not have any net dipole moment.

$O$ = $C$ = $O$

Water looks like

Thus, water will have dipole moment because of higher electronegativity of O.

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