Which of the following has a linear structure?

Which of the following can have a structure with $sp^3$ $C$ atoms only?

In $Cl_2O_{6(l)} + HF \to P + Q$. If $H$ of acid $HF$ attaches with $Q$,then identify the correct option for hybridization of $Cl$ atom and $\angle OClO$ in the $P$ and $Q$ ions.

The hybridization states of the chlorine atom in $ClO_4^-$,$ClO_3^-$,and $ClO_2^-$ are respectively .....

The hybrid state of sulphur in $SO_3$ molecule is

The type of hybrid orbitals used by the chlorine atom in $ClO_2^-$ is: