Total number of nodal planes present in the $d-$orbital which is used in the hybridisation of $XeF_2$.

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

What will be the $\% d$ character in $I_3^-$,according to hybridisation (in $\%$)?

Which one of the following is the correct set with respect to molecule,hybridization and shape?

Describe the shapes of $BF_3$ and $BH_4^-$. Assign the hybridisation of boron in these species.

The maximum number of $90^{\circ}$ angles between bond pair-bond pair of electrons is observed in