The low spin complex among the following is:

1.	\(\mathrm{Fe}(\mathrm{CN})_6^{3-} \)	2.	\(\mathrm{Co}\left(\mathrm{NO}_2\right)_6^{3-} \)
3.	\(\mathrm{Mn}(\mathrm{CN})_6^{3-} \)	4.	All of these

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 expected number of unpaired electrons for the complex ion [Cr(NH₃)₆]³⁺ are: 

1. 2

2. 3

3. 4

4. 5

The electronic configuration that represents the maximum magnetic moment is:

1. $d^3$

2. $d^2$

3. $d^8$

4. $d^6$(high spin)

The IUPAC name of [\(\mathrm {C r \left(en\right)_{3}}\)]\(\mathrm{C l}_{3}\)${\mathrm{}}_{}$ is:

The oxidation state of cobalt in the following molecule is:

1. 3

2. 1

3. 2

4. 0

The complex that can exhibit optical activity among the following is:

1. [CoCl₆]^3-

2. [Co(en)CI₄]^-

3. cis-[Co(en)₂Cl₂]⁺

4. trans-[Co(en)₂Cl₂]⁺ 

A person with osteoporosis is also experiencing lead poisoning, and ethylenediamine tetraacetic acid (EDTA) is prescribed for treatment. Which form of EDTA is most suitable for this administration?

1. EDTA

2. Tetrasodium salt

3. Disodium salt

4. Calcium dihydrogen salt

What is the correct electronic configuration of the central atom in \(K_{4}FeCN_{6}\) based on crystal field theory:

The  complex ion that does not expected to absorb visible light is:

1. $\left[Ni\right(CN{)}_4{]}^{\mathrm{2-}}$

2. $\left[Cr\right(N{H}_3{)}_6{]}^{3+}$

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

4. $\left[Ni\right(H_{2}O{)}_6{]}^{2+}$