Which of the following ions has Tetrahedral geometry and $sp^3$ hybridisation for its central atom?

In the process $XH_3 + H^{+} \to XH_4^+ (X = N, P, As, Sb)$,the maximum increase in bond angle occurs in the case of:

What type of hybridisation is involved in the central atom of hydrides of group $16$ elements?

In which of the following reactions does the hybridization of the central atom change from $sp^2$ to $sp^3$?

The formation of molecular complex $BF_3-NH_3$ results in a change in hybridization of boron

How many of the following species have $sp^3$ hybridisation of the central atom?
$SO_3$ (Solid),$H_3PO_2$,$S_2O_3^{2-}$,$XeO_2F_2$,$I_3^-$,$N_2O$,$NH_2^-$