The number of geometrical isomers of $\left[{\mathrm{CrCl}}_2\left(\mathrm{en}\right){\left({\mathrm{NH}}_3\right)}_2\right]$, where en = ethylenediamine, is

1.  2

2.  3

3.  4

4.  1

Among the following complexes, the one that can exhibit optical activity is

1.  ${\left[{\mathrm{CoCl}}_6\right]}^{3-}$

2.  ${\left[\mathrm{Co}\left(\mathrm{en}\right){\mathrm{CI}}_4\right]}^{-}$

3.  $\mathrm{cis}-{\left[\mathrm{Co}{\left(\mathrm{en}\right)}_2{\mathrm{Cl}}_2\right]}^{+}$

4.  trans-${\left[\mathrm{Co}{\left(\mathrm{en}\right)}_2{\mathrm{Cl}}_2\right]}^{+}$

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