If the dipole moment of an MX_3 molecule is z | vedclass

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(C) For an $MX_3$ molecule to have a dipole moment of zero,it must have a trigonal planar geometry.This geometry corresponds to $sp^2$ hybridization o

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$sp^2$ hybridized

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(C) For an $MX_3$ molecule to have a dipole moment of zero,it must have a trigonal planar geometry.This geometry corresponds to $sp^2$ hybridization of the central atom $M$.Since the atomic number of $M$ is less than $21$,it belongs to the $s$ or $p$ block elements (e.g.,$BF_3$ where $B$ has atomic number $5$).Therefore,the central atom $M$ uses $sp^2$ hybridized orbitals for sigma bonding.

If the dipole moment of an $MX_3$ molecule is zero,then the orbitals used by $M$ $(atomic\ number < 21)$ in sigma bonding are ....

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