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

Irving-Williams order for increasing stability of complexes formed by Co, Ni, Cu and Fe in +2 oxidation state is :

1. Co < Ni < Cu < Fe

2. Fe < Cu < Ni < Co

3. Fe < Co < Ni < Cu

4. Ni < Co < Cu < Fe

Which of the following correctly represents the structural formulas of the complexes PtCl₄·2NH₃ and PtCl₄·2KCl, respectively, if neither forms an AgCl precipitate with AgNO₃,
while one mole of each produces zero and three moles of ions in solution, respectively?

1. [PtCl₂(NH₃)₂]Cl₂ and K₂[PtCl₆]

2.  [PtCl₄(NH₃)₂] and K₂[PtCl₂(NH₃)₂]

3.  [PtCl₄(NH₃)₂] and K₂[PtCl₆]

4.  PtCl₄·2NH₃ and PtCl₄·2KCl

The correct IUPAC name for ${\left[\mathrm{Pt}{\left(\mathrm{en}\right)}_2\mathrm{Cl}\left(\mathrm{ONO}\right)\right]}^{2+}$ is :

1. Chlorodiethylenediaminenitritoplatinum(IV) ion

2. Bis(ethylenediamine)chloronitro-O-platinum(IV) ion

3. Chloridobis(ethylenediamine)nitritoplatinum(IV) ion

4. Chlorodiethylenediaminenitro-O-platinum(IV) ion

What are the final products formed when excess KCN is added to CuSO₄ solution?

1. ${\mathrm{K}}_3\left[\mathrm{Cu}{\left(\mathrm{CN}\right)}_4\right]$ and ${\left(\mathrm{CN}\right)}_2$

2. ${\mathrm{K}}_2\left[\mathrm{Cu}{\left(\mathrm{CN}\right)}_4\right]$ and ${\mathrm{Cu}}_2$${\left(\mathrm{CN}\right)}_2$

3. ${\mathrm{K}}_4\left[\mathrm{Cu}{\left(\mathrm{CN}\right)}_6\right]$ and ${\left(\mathrm{CN}\right)}_2$

4. $\mathrm{K}\left[\mathrm{Cu}{\left(\mathrm{CN}\right)}_4\right]$ and ${\mathrm{Cu}}_2$${\left(\mathrm{CN}\right)}_2$

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

The species having highest magnetic moment is:

1. ${\mathrm{K}}_4\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]$

2. $\left[\mathrm{Fe}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]{\mathrm{SO}}_4$

3. ${\mathrm{K}}_3\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]$

4. $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6\right]{\mathrm{SO}}_4$

Find the paramagnetic compound containing two unpaired electrons.

1. K₃[Fe(CN)₆]

2. K₂[NiCl₄]

3. K₂[CoCl₄]

4. Na₂[Ni(CN)₄]

Which of the following species can act as an oxidising agent?

1. $\left[\mathrm{Cr}{\left(\mathrm{CO}\right)}_6\right]$

2. $\left[\mathrm{Ni}{\left(\mathrm{CO}\right)}_4\right]$

3. $[\mathrm{Mn}{\left(\mathrm{CO}\right)}_6{]}^{+}$

4. $\left[\mathrm{V}{\left(\mathrm{CO}\right)}_6\right]$

Which among the following complexes can exhibit isomerism?