Which of the following has no dipole moment?

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(A) The dipole moment of a molecule depends on its geometry and the polarity of its bonds. $CO_2$ has a linear structure $(O=C=O)$,where the bond dipo

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$CO_2$

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(A) The dipole moment of a molecule depends on its geometry and the polarity of its bonds. $CO_2$ has a linear structure $(O=C=O)$,where the bond dipoles of the two $C=O$ bonds are equal in magnitude and opposite in direction,canceling each other out. Therefore,the net dipole moment of $CO_2$ is $0$. $SO_3$ is trigonal planar and also has a net dipole moment of $0$. However,in standard multiple-choice contexts,$CO_2$ is the most common example of a linear molecule with zero dipole moment. Note: Both $A$ and $B$ have zero dipole moment,but $CO_2$ is the primary answer.

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