Among the following the total number of polar molecules are______.
$C l_{2}, O C l, B F_{3}, N O, S O_{2}, X e F_{4}, H_{2} C C l_{2}, O C S$ .

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Solution

The molecules $O C l, N O, S O_{2}, C H_{2} C l_{2}, O C S$ are polar due to electronegativity difference between the bonded atoms.
$C l_{2}$ is non polar due to identical atom. $B F_{3}, X e F_{4}$ is polar due to symmetry.

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