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

The complex that can exhibit linkage isomerism is:

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]⁺ 

The oxidation state of cobalt in the following molecule is:

1. 3

2. 1

3. 2

4. 0

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

The geometry and magnetic properties of [NiCl₄]^2-, respectively, are : 

1. Tetrahedral, Paramagnetic

2. Tetrahedral, Diamagnetic

3. Square planar, Paramagnetic

4. Square planar, Diamagnetic  

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

The electronic configuration that represents the maximum magnetic moment is:

1. $d^3$

2. $d^2$

3. $d^8$

4. $d^6$(high spin)

Among the following, the compound that has the maximum coordination number is/are:

1. [Co(NH₃)₆]³⁺
2. [Cr(C₂O₄)₃]^3-
3. [CoCl₃(H₂O)₃]
4. All of the above have the same coordination number

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

1. 2

2. 3

3. 4

4. 5