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

IUPAC name of $\left[\mathrm{Pt}{\left({\mathrm{NH}}_3\right)}_2\mathrm{Cl}\left({\mathrm{NO}}_2\right)\right]$ is :

1.  Platinum diaminechloronitrite

2.  Chloronitrito-N-ammineplatinum (II)

3.  Diamminechloridonitrito-N-platinum (II)

4.  Diamminechloronitrito-N-platinate (II)

Note: In the following questions match the items given in Columns I and II.

Match the complexions given in Column I with the hybridization and number of unpaired electrons given in Column II and assign the correct code :

1.  A (3) B (1) C (5) D (2)

2.  A (4) B (3) C (2) D (1)

3.  A (3) B (2) C (4) D (1)

4.  A (4) B (1) C (2) D (3)

Note: In the following questions match the items given in Columns I and II.

Match the complex species given in Column I with the possible isomerism given in Column II and assign the correct code :

1.  A (1) B (2) C (4) D (5)

2.  A (4) B (3) C (2) D (1)

3.  A (4) B (1) C (5) D (3)

4.  A (4) B (1) C (2) D (3)

Match the compounds given in Column I with the oxidation state of cobalt present in it (given in Column II) and assign the correct code.

1. A=(1), B=(2), C=(4), D=(5)

2. A=(4), B=(3), C=(2), D=(1)

3. A=(5), B=(1), C=(4), D=(2)

4. A=(4), B=(1), C=(2), D=(3)