${\left[{\mathrm{Fe}}^{\mathrm{II}}\mathrm{Cl}{\left(\mathrm{CN}\right)}_4\left({\mathrm{O}}_2\right)\right]}^{4-}$ 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 ${\mathrm{cm}}^{-1}$

The correct order of energies of d-orbitals of metal ion in a square planar complex is-

1. ${\mathrm{d}}_{\mathrm{xy}}={\mathrm{d}}_{\mathrm{yz}}={\mathrm{d}}_{\mathrm{zx}}>{\mathrm{d}}_{{\mathrm{x}}^2-{\mathrm{y}}^2}={\mathrm{d}}_{{\mathrm{z}}^2}$

2. ${\mathrm{d}}_{{\mathrm{x}}^2-{\mathrm{y}}^2}={\mathrm{d}}_{{\mathrm{z}}^2}>{\mathrm{d}}_{\mathrm{xy}}={\mathrm{d}}_{\mathrm{yz}}={\mathrm{d}}_{\mathrm{zx}}$

3. ${\mathrm{d}}_{{\mathrm{x}}^2-{\mathrm{y}}^2}>{\mathrm{d}}_{{\mathrm{z}}^2}>{\mathrm{d}}_{\mathrm{xy}}>{\mathrm{d}}_{\mathrm{yz}}={\mathrm{d}}_{\mathrm{zx}}$

4. ${\mathrm{d}}_{{\mathrm{x}}^2-{\mathrm{y}}^2}>{\mathrm{d}}_{\mathrm{xy}}>{\mathrm{d}}_{{\mathrm{z}}^2}>{\mathrm{d}}_{\mathrm{zx}}={\mathrm{d}}_{\mathrm{yz}}$

${\left[{\mathrm{CoCl}}_2{\left({\mathrm{NH}}_3\right)}_4\right]}^{+}+C{l}^{-}\to \left[{\mathrm{CoCl}}_3{\left({\mathrm{NH}}_3\right)}_3\right]+{\mathrm{NH}}_3$

If in the above reaction only one isomer of the product is obtained, which is true for the initial
(reactant) complex

1. Compound is in cis form

2. Compound is in trans form

3. Compound is in both (cis and trans) forms

4. Can't be predicted

Aqueous solution of Ni²⁺ contains ${\left[\mathrm{Ni}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$ and its magnetic moment is 2.83 B.M.When ammonia is added in it, comment on the magnetic moment of solution

1. It will remain same

2. It increases from 2.83 B.M.

3. It decreases from 2.83 B.M.

4. It can not be predicted theoretically

Among the following, the $\mathrm{\pi }$-acid ligand is

1.  ${\mathrm{F}}^{-}$

2.  ${\mathrm{NH}}_3$

3.  ${\mathrm{CN}}^{-}$

4.  l