$\mathrm{\pi }$ bonding is not involved in

1. Ferrocene

2. Dibenzene Chromium

3. Zeise’s Salt

4. Grignard Feagent

The co-ordination number of Fe in Ferrocene is

1. 2

2. 5

3. 6

4. 10

[Fe(H₂O)₆]³⁺ and [Fe(CN)₆]^3- differ in:

1. Magnetic nature

2. Oxidation number

3. Co-ordination number

4. Structure

The number of geometrical isomers possible for a square planar complex ${\left[\mathrm{Mabcd}\right]}^{\pm \mathrm{n}}$ are

EAN of Fe in K₃[Fe(CN)₆] is

1. 34

2. 35

3. 36

4. 37

Which of the following is not an ambidentate ligand?

1. ${\mathrm{CN}}^{-}$

2. ${\mathrm{NO}}_2^{-}$

3. ${\mathrm{SCN}}^{-}$

4. ${\mathrm{NH}}_3$

[Cr(en)₂Br₂ ]⁺ can show

1. Optical isomerism

2. Geometrical isomerism

3. Both (1) and (2) 

4. Neither (1) nor (2)

The coordination number of copper in cuprammonium sulphate is

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

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