The mode of hybridisation of carbon in $CO_2$ is

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 ............... .

Which set of hybridisation is correct for the following compounds:
$NO_2$,$SF_4$,$PF_6^-$

The state of hybridisation of the central atom in the dimer of $BH_3$ and $BeH_2$ is

In the formation of the $CH_4$ molecule,carbon makes use of:

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