The complex ion among the following that cannot absorb visible light is:

1. [Ni(CN)₄]^2-

2. [Cr(NH₃)₆]³⁺

3. [Fe(H₂O)₆]²⁺

4. [Ni(H₂O)₆]²⁺

Crystal field stabilization energy for high spin d⁴ octahedral complex is

1. -1.8 ${∆}_0$

2. -1.6 ${∆}_0$+P

3. -1.2 ${∆}_0$

4. -0.6 ${∆}_0$

The existence of two different coloured complexes with the composition of [Co(NH₃)₄Cl₂]⁺  is due to:

Which of the following complexes exhibits the highest paramagnetic behavior ? 
where gly = glycine, en = ethylene Jiamine and bpy = bipyridyl moieties 
(At no : Ti= 22 V = 21! Fe = 26, Co = 27)

1.  ${\left[\mathrm{V}{\left(\mathrm{gly}\right)}_2{\left(\mathrm{OH}\right)}_2{\left({\mathrm{NH}}_3\right)}_2\right]}^{+}$

2.  ${\left[\mathrm{Fe}\left(\mathrm{en}\right) \left(\mathrm{bpy}\right) {\left({\mathrm{NH}}_3\right)}_2\right]}^{2+}$

3.  ${\left[\mathrm{Co}{\left(\mathrm{OX}\right)}_2{\left(\mathrm{OH}\right)}_2\right]}^{-}$

4.  ${\left[\mathrm{Ti}{\left({\mathrm{NH}}_3\right)}_6\right]}^{3+}$

In which of the following coordination entities the magnitude of \(\Delta_{oct}\)(CFSE in the octahedral field) will be maximum? 
(Atomic number Co = 27)

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

2. [Co(NH₃)₆]³⁺

3.  ${\left[\mathrm{Co}{\left(\mathrm{CN}\right)}_6\right]}^{3-}$

4.  ${\left[\mathrm{Co}{\left({\mathrm{C}}_2{\mathrm{O}}_4\right)}_3\right]}^{3-}$

Which of the following will give a pair of enantiomorphs? 
(en = NH₂ CH₂CH₂ NH₂)

1. $\left[Co\right(N{H}_3{)}_{4}C{l}_2]N{O}_2$

2. $\left[Cr\right(N{H}_3{)}_6\left]\right[Co\left(CN{)}_6\right]$

3. $\left[Co\right(en{)}_{2}C{l}_2]Cl$

4. $\left[Pt\right(N{H}_3{)}_4\left]\right[PtC{l}_6]$

[Co(NH₃)₄(NO₂)₂]Cl exhibits :

1. Linkage isomerism, ionization isomerism and optical isomerism

2. Linkage isomerism, ionization isomerism and geometrical isomerism

3. Ionization isomerism,geometrical isomerism and optical isomerism

4. Linkage isomerism, geometrical isomerism and optical isomerism

What is the correct electronic configuration of the central atom in ${\mathrm{K}}_4\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]$ based on crystal field theory?

1.  ${\mathrm{e}}^4$ ${\mathrm{t}}_2^2$

2.  ${\mathrm{t}}_{2\mathrm{g}}^{}$ $$ $4$ ${\mathrm{e}}_{\mathrm{g}}^2$

3.  ${\mathrm{t}}_{2\mathrm{g}}^{}$ $$ $6$ ${\mathrm{e}}_{\mathrm{g}}^0$

4.  ${\mathrm{e}}^3$ ${\mathrm{t}}_2^3$