The complex that will exhibit maximum ionic conductivity in aqueous solution is:

1. K₄[Fe(CN)₆]

2. [Co(NH₃)₆]Cl₃

3. [Cu(NH₃)₄]Cl₂

4. [Ni(CO)₄]

Identify the outer orbital complex among the following options.
(Atomic number Mn=25, Fe=26, Co=27, Ni=28)

1. [Fe(CN)₆]^4-

2. [Mn(CN)₆]^4-

3. [Co(NH₃)₆]³⁺

4. [Ni(NH₃)₆]²⁺

Pick out the correct statement with respect to [Mn(CN)₆]^3-.
 

1. It is sp³d² hybridised and octahedral.

2. It is d²sp³ hybridised and octahedral.

3. It is sp³d² hybridised and tetrahedral.

4. It is dsp² hybridised and square planar.

A compound among the following has both fac-mer and optical isomers is:

1. [Co(NH₃)₅(NO₃)]     

2. [Co(en)₃]³⁻

3. [Co(gly)₃]

4. None of the above

The coordination entity among the following has the maximum magnitude of  ∆ ₀(CFSE in octahedral field).

1. [Co(H₂O)₆]³⁺

2. [Co(NH₃)₆]³⁺

3. [Co(CN)₆]^3-

4. [Co(C₂O₄)₃]^3-

The most stable complex among the following species is:

1.  $\left[\mathrm{Fe}{\left(\mathrm{CO}\right)}_5\right]$

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

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

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

Identify the system with the highest number of unpaired electrons among the following is:
1. d${}^5$ (Octahedral, low spin)

2. d${}^8$ (Tetrahedral)

3. d${}^6$ (Octahedral, low spin)

4. d${}^3$ (Octahedral)

The oxidation state of cobalt in the following molecule is:

1. 3

2. 1

3. 2

4. 0