The correct representation of Potassium tris(oxalato)chromate(III) is:

$1.$ ${\mathrm{K}}_2\left[\mathrm{Cr}{\left({\mathrm{C}}_2{\mathrm{O}}_4\right)}_3\right]$
$2.$ ${\mathrm{K}}_3\left[\mathrm{Cr}{\left({\mathrm{C}}_2{\mathrm{O}}_4\right)}_3\right]$
$3.$ ${\mathrm{K}}_3\left[\mathrm{Cr}{\left({\mathrm{C}}_2{\mathrm{O}}_4\right)}_2\right]$
$4.$ ${\mathrm{K}}_2\left[\mathrm{Cr}{\left({\mathrm{C}}_2{\mathrm{O}}_4\right)}_4\right]$

The correct splitting diagram of d orbitals in an octahedral crystal field is:

1.		2.
3.		4.	None of these.

Optical isomerism is exhibited by among the following is/are:

[Cr(NH₃)₆]³⁺ is paramagnetic ,while ${\left[\mathrm{Ni}{\left(\mathrm{CN}\right)}_4\right]}^{2-}$ is diamagnetic because:

The crystal field splitting energy is:

A metal ion present in vitamin B₁₂ is:

$$The correct statement among the following regarding \(FeCO_5\) is:

1. Tetranuclear

2. Mononuclear

3. Trinuclear

4. Dinuclear

Number of geometrical isomer(s) possible for the complex [Cr(C₂O₄)₃]^3- is/are:

The correct statements about ethane-1,2-diamine as a ligand are:

The correct electronic configuration of the central atom in ${\mathrm{K}}_4\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]$  based on crystal field theory is: