Which of the following orbitals involved in a hybridisation of ${\text{ IF }}_7$ ? 

${\text{ IF }}_7$ will have a pentagonal bipyramidal form.
In${\text{ IF }}_7$, the core atom's hybridization is ${\mathrm{sp}}^3{\mathrm{d}}^3$.

Hence $\mathrm{s}+{\mathrm{p}}_{\mathrm{x}}+{\mathrm{p}}_{\mathrm{y}}+{\mathrm{p}}_{\mathrm{z}}+{\mathrm{d}}_{\mathrm{xy}}+{\mathrm{d}}_{{\mathrm{x}}^2-{\mathrm{y}}^2}+{\mathrm{d}}_{{\mathrm{z}}^2}$