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

1. 2
2. 3
3. 4
4. 5

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

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

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

1.  d⁷

2.  d⁸

3.  d⁴

4.  d⁹