SO3 has zero dipole moment. Why ?...

`SO_3` has zero dipole moment. Why ?

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In the gaseous state `SO_3` has triangular planer structuure with `-O - S -O` bond Angle of `120^@` each. Therefore individual S - O dipole moment cancel each other and resultant dipole moment is zero.
Dipole moment `(mu) = 0`

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