Number of possible isomers for the complex [Co(en)₂Cl₂]Cl will be:
(en=ethylenediamine) 

1.	2	2.	1
3.	3	4.	4

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

A complex has a molecular formula MSO₄Cl.6H₂O. Its aqueous solution gives white precipitate with barium chloride solution and no precipitate is obtained when it is treated with silver nitrate solution.

If the secondary valence of the metal is six, the correct representation of the complex is:

1. [M(H₂O)₄Cl]SO₄.2H₂O
2. [M(H₂O)₆]SO₄  
3. [M(H₂O)₅Cl]SO₄.H₂O
4. [M(H₂O)₃Cl]SO₄.3H₂O

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:

The complex among the following with the highest value of crystal field splitting energy is :

Two complexes, ${\mathrm{PtCl}}_4·2{\mathrm{NH}}_3$ and ${\mathrm{PtCl}}_4·2\mathrm{KCl}$, do not give a precipitate of AgCl when treated with ${\mathrm{AgNO}}_3$. They give zero and three moles of ions, respectively, in solutions for one mole of the complex.  The structural formulae of both complexes are:

1. $\left[{\mathrm{PtCl}}_2{\left({\mathrm{NH}}_3\right)}_2\right]{\mathrm{Cl}}_2$ and ${\mathrm{K}}_2\left[{\mathrm{PtCl}}_6\right]$ 

2. $\left[{\mathrm{PtCl}}_4{\left({\mathrm{NH}}_3\right)}_2\right]$ and ${\mathrm{K}}_2\left[{\mathrm{PtCl}}_2{\left({\mathrm{NH}}_3\right)}_2\right]$ 

3. $\left[{\mathrm{PtCl}}_4{\left({\mathrm{NH}}_3\right)}_2\right]$ and ${\mathrm{K}}_2\left[{\mathrm{PtCl}}_6\right]$ 

4. $\left[{\mathrm{PtCl}}_4\right]·2{\mathrm{NH}}_3$ and $\left[{\mathrm{PtCl}}_4\right]·2\mathrm{KCl}$ 

Which of the following compounds has the maximum coordination number?

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