The total number of geometrical isomers possible for an octahedral complex of this type $\left[{\mathrm{MA}}_2{\mathrm{B}}_2{\mathrm{C}}_2\right]$ is 

(M = transition metal; A, B and C are monodentate ligands)

1.  3

2.  4

3.  5

4.  6

The metal carbonyl which is paramagnetic is

1.  Ni ${\left(\mathrm{CO}\right)}_4$

2.  V ${\left(\mathrm{CO}\right)}_6$

3.  Cr ${\left(\mathrm{CO}\right)}_6$

4.  Fe ${\left(\mathrm{CO}\right)}_5$

The complex having zero crystal field stabilization energy is

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

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

3.  ${\left[\mathrm{Co}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$

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

IUPAC name of complex ion ${\left[{\mathrm{CrCl}}_2{\left(\mathrm{ox}\right)}_2\right]}^{3-}$ is

1.  Dichlorodioxalatochromium (lll)

2.  Dioxalatodichloromate (lll)

3.  Dichlorodioxalatochromate (lll)

4.  Bisoxalaedichlorochromate (lll)

Which of the following complexes formed by ${\mathrm{Cu}}^{2+}$ ions is most stable?

1.  ${\mathrm{Cu}}^{2+}+4{\mathrm{NH}}_3 \rightleftharpoons {\left[\mathrm{Cu}{\left({\mathrm{NH}}_3\right)}_4\right]}^{2+}, \log \mathrm{K}=11.6$

2.  ${\mathrm{Cu}}^{2+} + 4\mathrm{CN}– \rightleftharpoons [\mathrm{Cu}{\left(\mathrm{CN}\right)}_4{]}^{2-} , \mathrm{logK} = 27.3$

3.  ${\mathrm{Cu}}^{2+} + 2\mathrm{en} \rightleftharpoons [\mathrm{Cu}{\left(\mathrm{en}\right)}_2{]}^{2+} , \mathrm{logK} = 15.4$

4.  ${\mathrm{Cu}}^{2+} + 4{\mathrm{H}}_2\mathrm{O} \rightleftharpoons [\mathrm{Cu}{\left({\mathrm{H}}_2\mathrm{O}\right)}_4{]}^{2+} , \mathrm{logK} = 8.9$

The color of the coordination compounds depends on the crystal field splitting. What will be the correct order of absorption of the wavelength of light in the visible region, for the complexes, ${\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6\right]}^{3+}, {\left[Co{\left(CN\right)}_6\right]}^{3-}, {\left[Co{\left(H_{2}O\right)}_6\right]}^{3+}$

1.   $[\mathrm{Co}{\left(\mathrm{CN}\right)}_6{]}^{3-}$ > $[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6{]}^{3+}$ > $[\mathrm{Co}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6{]}^{3+}$

2.  $[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6{]}^{3+}$ > $[\mathrm{Co}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6{]}^{3+}$ > $[\mathrm{Co}{\left(\mathrm{CN}\right)}_6{]}^{3-}$

3.   $[\mathrm{Co}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6{]}^{3+}$ > $[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6{]}^{3+}$ > $[\mathrm{Co}{\left(\mathrm{CN}\right)}_6{]}^{3-}$

4.   $[\mathrm{Co}{\left(\mathrm{CN}\right)}_6{]}^{3-}$ > $[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6{]}^{3+}$ > $[\mathrm{Co}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6{]}^{3+}$

The correct IUPAC name of [$\left[\mathrm{Pt}{\left({\mathrm{NH}}_3\right)}_2{\mathrm{Cl}}_2\right]$ is

1.  Diamminedichloridoplatinum (II)

2.  Diamminedichloridoplatinum (IV)

3.  Diamminedichloridoplatinum (0)

4.  Dichloridodiammineplatinum (IV)

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

A chelating agent has two or more than two donor atoms to bind to a single metal ion. Which of the following is not a chelating agent?

1. Thiosulphato

2. Oxalato

3. Glycinato

4. Ethane-1,2-diamine

What kind of isomerism exists between $\left[\mathrm{Cr}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]C{l}_3$ (violet) and $\left[\mathrm{Cr}{\left({\mathrm{H}}_{\mathrm{2}}\mathrm{O}\right)}_{5}Cl\right]C{l}_2.H_{2}O$ (greyish-green)?

1.  Linkage isomerism

2.  Solvate isomerism

3.  Ionization isomerism

4.  Coordination isomerism