What is the hybridization of the iodine atom in $ICl_2^-$?

What is $sp$ hybridization? Give its characteristics.

Which of the following species uses both axial set of $d-$ orbitals in the hybridization of the central atom?

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

Identify the molecules which have $sp$-hybridised carbon$(s)$ from the list given below:
$I$. Ethane nitrile $(CH_3CN)$
$II$. Buta$-1,3-$diene $(CH_2=CH-CH=CH_2)$
$III$. Propan$-1,2-$diene $(CH_2=C=CH_2)$
$IV$. Ethyne $(HC \equiv CH)$
$V$. Benzene $(C_6H_6)$

Consider the following reaction: $MX_4 + X'_2 \to MX_4X'_2$. If the atomic number of $M$ is $52$ and $X$ and $X'$ are halogens and $X'$ is more electronegative than $X$. Then choose the correct statement regarding the given information.