If molecule `MX_3` has zero dipole moment, the sigma bonding orbitals used by M (atomic number `lt21`) are

Options

A. pura`P`
B. sp-hybridised
C. `sp^(2)`-hybridised
D. `sp^(3)` hybridised

Answer

C

Explanation

Dipole momnet is a vector quantity
In trigonal planar geometry (for `sp^(2)` hybridisation) the vector sum of two bond moments is equal and oposite to the dipole moment of third bond .