Which $d-$orbital of metal in $[Fe(CO)_5]$ is involved in hybridisation?

Which of the following statements is correct with respect to $[Mn(CN)_6]^{3-}$?

What will be the type of hybridization if the shapes are square planar,octahedral,and linear,respectively?

Which of the following matches is incorrect?
Complex compounds $-$ Type of hybridization

According to valence bond theory,the metal atom or ion can make use of which of the following orbitals to yield hybrid orbitals that can form bonds with ligands?

The statements that are incorrect about the nickel$(II)$ complex of dimethylglyoxime are:
$A$. It is red in colour
$B$. It has a high solubility in water at $pH = 9$
$C$. The $Ni$ ion has two unpaired $d$-electrons
$D$. The $N - Ni - N$ bond angle is almost close to $90^{\circ}$
$E$. The complex contains four five-membered metallacycles (metal containing rings)
Choose the correct answer from the options given below: