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:

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

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

The low spin complex among the following is:

The complex that can exhibit linkage isomerism is:

For a tetrahedral complex [MCl₄]^2-, the spin-only magnetic moment is 3.83 B.M. The element M is:

1. Co

2. Cu

3. Mn

4. Fe