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  4. If a molecule MX3 has zero dipole moment, the sigma bonding orbital used by M are

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Q. If a molecule $MX_3$ has zero dipole moment, the sigma bonding orbital used by M are

KEAMKEAM 2004Chemical Bonding and Molecular Structure

Solution:

If a molecule $MX_3$ ( e.g., $BF_3$) has a zero dipole moment, the $\sigma$-bonding orbital used by M are $sp^2$-hybrid. The zero dipole moment is due to its symmetrical (trigonal planar) structure.