Which one of the following complexes is an outer orbital complex :-

1. [Co(NH${}_3$)${}_6$]${}^{3+}$

2. [Mn(CN)${}_6$]${}^{4-}$

3. [Fe(CN)${}_6$]${}^{4-}$

4. [Ni(NH${}_3$)${}_6$]${}^{2+}$

(Atomic nos.:Mn=25 ; Fe=26 ; Co=27 ; Ni = 28)

The IUPAC name for the complex [Co(NO${}_2$) (NH${}_3$)${}_5$ ]Cl${}_2$ is

1. Pentaammine nitrito-N- cobalt (II) chloride

2. Pentaammine nitrito-N- cobalt (III) chloride

3. Nitrito-N- pentaamminecobalt (III) chloride

4. Nitrito-N- pentaamminecobalt (II) chloride

Which among the following complexes can exhibit isomerism?

$\left[\mathrm{Cr}{\left({\mathrm{NH}}_3\right)}_5\mathrm{Br}\right]Cl$ and $\left[\mathrm{Cr}{\left({\mathrm{NH}}_3\right)}_5\mathrm{Cl}\right]Br$  can be distinguished by/and isomerism shown is:

1. ${\mathrm{BaCl}}_2$, ionisation

2. ${\mathrm{AgNO}}_3$, ionisation

3. ${\mathrm{AgNO}}_3$, coordinate

4. ${\mathrm{BaCl}}_2$, linkage

${\left[{\mathrm{Fe}}^{\mathrm{II}}\mathrm{Cl}{\left(\mathrm{CN}\right)}_4\left({\mathrm{O}}_2\right)\right]}^{4-}$ is named as:

1. Chlorotetracyanodioxoferrate (II) ion

2. Chlorotetracyanoperoxoferrate (II) ion

3. Chlorotetracyanosuperoxoferrate (II) ion

4. None of the correct

Geometrical isomerism in coordination compunds is exhibited by
1. Square planar and tetrahedral complexes
2. Square planar and octahedral complexes
3. Tetrahedral and octahedral complexes
4. Squre planar, tetrahedral and octahedral complexes

Which of the following is not optically active?

1. ${\left[\mathrm{Co}{\left(\mathrm{en}\right)}_3\right]}^{3+}$

2. ${\left[\mathrm{Cr}{\left(\mathrm{ox}\right)}_3\right]}^{3-}$

3. $\mathrm{cis}-{\left[{\mathrm{CoCl}}_2{\left(\mathrm{en}\right)}_2\right]}^{+}$

4. $\mathrm{trans}-{\left[{\mathrm{CoCl}}_2{\left(\mathrm{en}\right)}_2\right]}^{+}$

Arrange the following in order of decreasing number of unpaired electrons:

(I) ${\left[\mathrm{Fe}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$  (II) ${\left[\mathrm{Fe}{\left(CN\right)}_6\right]}^{3-}$

(III) ${\left[\mathrm{Fe}{\left(CN\right)}_6\right]}^{4-}$  (IV) ${\left[\mathrm{Fe}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{3+}$

1. IV, I, II, III

2. I, II, III, IV

3. III, II, I, IV

4. II, III, I, IV

Of the following complex ions, the one that probably has the largest overall formation constant,
K_f , is

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

2. ${\left[\mathrm{Co}{\left(H_{2}O\right)}_6\right]}^{3+}$

3. ${\left[\mathrm{Co}{\left(H_{2}O\right)}_4{\left({\mathrm{NH}}_3\right)}_2\right]}^{3+}$

4. ${\left[\mathrm{Co}{\left(\mathrm{en}\right)}_3\right]}^{3+}$

The CFSE for  [CoCl₆]^4-  is 18000  cm^-1. The  ∆_t  for  [CoCl₄]^2- will be :

1. 18000 ${\mathrm{cm}}^{-1}$

2. 16000 ${\mathrm{cm}}^{-1}$

3. 8000 ${\mathrm{cm}}^{-1}$

4. 2000 ${\mathrm{cm}}^{-1}$