The types of hybrid orbitals of nitrogen in $NO_2^+$, $NO_3^-$ and $NH_4^+$ respectively are

In $XeF_{4}$,the hybridization is:

Total number of species from the following with central atom utilising $sp^2$ hybrid orbitals for bonding is.................... $NH_3, SO_2, SiO_2, BeCl_2, C_2H_2, C_2H_4, BCl_3, HCHO, C_6H_6, BF_3, C_2H_4Cl_2$

Explain the bond formation by $sp$ orbitals.

The geometry of the molecule with $sp^3d^2$ hybridised central atom is

Methane is tetrahedral but not square planar in nature,prove it.