What type of orbital hybridisation is considered on $P$ in $PCl_5$?

Which among the following molecules is $(a)$ involved in $sp^3d$ hybridization,$(b)$ has different bond lengths and $(c)$ has a lone pair of electrons on the central atom?

Two $p$-block elements $X$ and $Y$ form fluorides of the type $EF_3$. The fluoride compound $XF_3$ is a Lewis acid and $YF_3$ is a Lewis base. The hybridization of the central atoms of $XF_3$ and $YF_3$ respectively are

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

Select the molecule in which all the atoms may lie on a single plane.

The hybridisation and shape of $I_3^{-}$ ion,respectively,are