Which of the following types of hybridisation results in trigonal planar geometry?

As the $s$-character of the hybrid orbital decreases,the bond angle ...........

$C-H$ bond length is greatest in

What is the hybridisation of each carbon in $H_2C = C = CH_2$?

In which of the following compounds will the angle between two covalent bonds be the largest?

Among $[I_3]^{+}$,$[SiO_4]^{4-}$,$SO_2Cl_2$,$XeF_2$,$SF_4$,$ClF_3$,$Ni(CO)_4$,$XeO_2F_2$,$[PtCl_4]^{2-}$,$XeF_4$,and $SOCl_2$,the total number of species having $sp^3$ hybridised central atom is. . . . .