Iron carbonyl, $\mathrm{Fe}{\left(\mathrm{CO}\right)}_5$ is

1. tetranuclear
2. mononuclear
3. trinuclear
4. dinuclear

The sum of coordination number and oxidation number of the metal M in the complex [M(en)₂(C₂O₄)]Cl is -

1. 9

2. 6

3. 7

4. 8

Which of the following complexes is used as an anticancer agent?

1. mer-[Co(NH₃)₃Cl₃]

2. $Cis-\left[PtC{l}_2\right(N{H}_3{)}_2]$

3. $Cis-K_2[Pt C{l}_{2}B{r}_2]$

4. $N{H}_{2}CoC{l}_4$

Jahn-Teller effect is not observed in high spin complexes of

1.  d⁷

2.  d⁸

3.  d⁴

4.  d⁹

The correct increasing order of trans-effect of the following species is

1.  ${\mathrm{NH}}_3>{\mathrm{CN}}^{-}>\mathrm{Br}>{\mathrm{C}}_6{\mathrm{H}}_5^{-}$

2.  ${\mathrm{CN}}^{-}>{\mathrm{C}}_6{\mathrm{H}}_5^{-}>{\mathrm{Br}}^{-}>{\mathrm{NH}}_3$

3.  ${\mathrm{Br}}^{-}>{\mathrm{CN}}^{-}>{\mathrm{NH}}_3>{\mathrm{C}}_6{{\mathrm{H}}^{-}}_5$

4.  ${\mathrm{CN}}^{-}>{\mathrm{Br}}^{-}>{\mathrm{C}}_6{{\mathrm{H}}^{-}}_5>{\mathrm{NH}}_3$

Correct increasing order for the wavelengths of absorption in the visible region the complexes of Co³⁺are:

1. $\left[Co\right(H_2{O}_{}{)}_6{]}^{3+}, \left[Co\right(en{)}_3{]}^{3+},\left[Co\right(N{H}_3{)}_6{]}^{3+}$

2. $\left[Co\right(H_{2}O{)}_6{]}^{3+}, \left[Co\right(N{H}_3{)}_6{]}^{3+},\left[Co\right(en{)}_3{]}^{3+}$

3. $\left[Co\right(N{H}_3{)}_6{]}^{3+}, \left[Co\right(en{)}_3{]}^{3+},\left[Co\right(H_2{O}_{}{)}_6{]}^{3+}$

4. $\left[Co\right(en{)}_3{]}^{3+}, \left[Co\right(N{H}_3{)}_6{]}^{3+},\left[Co\right(H_{2}O{)}_6{]}^{3+}$

The IUPAC name of $\left[\mathrm{Co}\left(\mathrm{ONO}\right){\left({\mathrm{NH}}_3\right)}_5\right]{\mathrm{Cl}}_2$ is 

1.  Pentamminenitrocobalt(II)chloride

2.  Pentamminenitrsoocobalt(III)chloride  

3. Pentaaminenitrito -O-cobalt(III)chloride.  

4. Pentammineoxo-nitrocobalt(III)chloride

The coordination number of copper in cuprammonium sulphate is