What is the hybridisation and shape of $Cr$ in chromyl chloride $(CrO_2Cl_2)$?

The shape of $[Cu(NH_3)_4]^{2+}$ is square planar. The $Cu^{2+}$ ion in this complex is:

Which set of $d-$ orbitals is used by the central metal during the formation of $MnO_4^-$?

Match List-$I$ with List-$II$ and select the correct answer using the codes given below the lists $:$

List-$I$ $(Compounds)$	List-$II$ $(Hybridization)$
$(a)$ $[Ni(NH_3)_6]^{+2}$	$(i)$ $sp^3 d^2$
$(b)$ $[PtCl_4]^{-2}$	$(ii)$ $dsp^2$
$(c)$ $[Ni(CO)_4]$	$(iii)$ $sp^3$
$(d)$ $[Co(OX)_3]^{-3}$	$(iv)$ $d^2 sp^3$

Match the coordination number and type of hybridisation with the distribution of hybrid orbitals in space based on Valence Bond Theory.

Coordination number and type of hybridisation	Distribution of hybrid orbitals in space
$a. 4, sp^3$	$i. \text{trigonal bipyramidal}$
$b. 4, dsp^2$	$ii. \text{octahedral}$
$c. 5, sp^3d$	$iii. \text{tetrahedral}$
$d. 6, d^2sp^3$	$iv. \text{square planar}$

Select the correct option.

The complex ion $[Cu(NH_3)_4]^{2+}$ has which of the following geometries and electronic configurations?