The type of isomerism shown by [Co(NH₃)₆][Cr(CN)₆] and  [Cr (NH₃)₆] [Co(CN)₆] is:
 

1.	Ionisation isomerism
2.	Co-ordination isomerism
3.	Geometrical isomerism
4.	Linkage isomerism

The complex ion among the following that cannot absorb visible light is:

1. [Ni(CN)₄]^2-

2. [Cr(NH₃)₆]³⁺

3. [Fe(H₂O)₆]²⁺

4. [Ni(H₂O)₆]²⁺

The most stable complex among the following species is:

1.  $\left[\mathrm{Fe}{\left(\mathrm{CO}\right)}_5\right]$

2.  $[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6{]}^{3-}$

3.  $[\mathrm{Fe}{\left({\mathrm{C}}_2{\mathrm{O}}_4\right)}_3{]}^{3-}$

4.  $[\mathrm{Fe}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6{]}^{3+}$

[Fe(H₂O)₆]³⁺ and [Fe(CN)₆]^3- differ in:

1. Magnetic nature

2. Oxidation number

3. Co-ordination number

4. Structure

The isomerism displayed by K₃[Co(NO₂)₆] and K₃[Co(ONO)₆] is: 

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:

Among the following, the compound that has the maximum coordination number is/are:

1. [Co(NH₃)₆]³⁺
2. [Cr(C₂O₄)₃]^3-
3. [CoCl₃(H₂O)₃]
4. All of the above have the same coordination number

The geometry and magnetic properties of [NiCl₄]^2-, respectively, are : 

1. Tetrahedral, Paramagnetic

2. Tetrahedral, Diamagnetic

3. Square planar, Paramagnetic

4. Square planar, Diamagnetic  

For a tetrahedral complex [MCl₄]^2-, the spin-only magnetic moment is 3.83 B.M. The element M is:

1. Co

2. Cu

3. Mn

4. Fe

The complex that can exhibit linkage isomerism is: