Hybridization is due to the overlapping of

The molecule in which the central atom does $NOT$ undergo $sp^3$ hybridisation is

What is the hybridisation state of the central atom and the shape of the conjugate base of the ammonium ion?

Identify the pair of molecules in which the hybridization of the central atom is $sp^2$ with bent geometry.

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

$sp^3$ hybridized nitrogen is present in