What is the bond angle around an atom that undergoes $sp^2$ hybridization?

Fill in the blanks:
$(i)$ Based on the type of overlapping,covalent bonds are classified into ........ and .......... .
$(ii)$ The bond formation involving hybrid orbitals is called ............. .
$(iii)$ The type of hybridization observed in the $C_2H_6$ molecule is ........... .
$(iv)$ The type of hybridization observed in the $BrF_5$ complex is ............... .

The $PCl_5$ molecule is a result of the hybridisation of

What is the hybridization of the $Cl$ atom in $ClO^{-}_2$?

Hybridisation of the central atom in $NF_3$ is

With which of the given pairs does $CO_2$ resemble in terms of structure?