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 the above

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 having osteoporosis is suffering from lead poisoning. Ethylenediamine tetraacetic acid (EDTA) is administered for this condition. The best form of EDTA to be used for such administration is:

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:

1. \(e^{4}   t_{2 g}^{    2}\)

2. \(t_{2 g}^{    4}   e_{g}^{2}\)

3. \(t_{2 g}^{    6}   e_{g}^{0}\)

4. \(e^{3}   t_{2 g}^{  3}\)

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