Q.

 which one of the following have zero dipole moment 

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a

CCl4

b

XeF2

c

XeF4

d

I3

answer is A, B, C, D.

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Detailed Solution

There are certain molecules that have zero dipole moment and some having non-zero dipole moment. Molecules that have zero dipole molecule considered as non-polar molecules.
There are two major conditions in which molecule has zero dipole moment:
1. There is negligible or zero electronegativity difference between the bonded atom.
2. Molecule has symmetrical shape due to which the resultant dipole moment becomes zero.

CCl4 has tetrahedral which is symmetrical.

XeF3 and I3- have linear shape which is symmetrical.

XeF4 has square planar shape which is also symmetrical.

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 which one of the following have zero dipole moment