The hybridization of $P$ exhibited in $PF_{5}$ is $sp^{x}d^{y}$. The value of $y$ is $...$

The nature of hybridization in the $NH_3$ molecule is

The $H-O-H$ bond angles in $H_3O^+$ are approximately $107^\circ$. The orbitals used by oxygen in these bonds are best described as

The hybridisations of $N$,$C$ and $O$ shown in the following compound are:

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

In allene $(C_3H_4)$,the type$(s)$ of hybridisation of the carbon atoms is (are):