select the cottect IUPAC name of `[Co(H_(2)NCH_(2)CH_(2)NH_(2))_(3)]_(2)(SO_(4))_(3)` is :

Options

A. Tris (ethane-1, 2-diamine) cobalt (III) sulphate
B. Tris (ethane-1, 2-diamine) cobaltate (III) sulphate
C. Tris (ethane-1, 2-diamine) cobaltate (II) sulphate
D. None of the above

Answer

To find the correct IUPAC name of the complex `[Co(H2NCH2CH2NH2)3]2(SO4)3`, we will follow a systematic approach to nomenclature.

### Step-by-Step Solution:

1. **Identify the Components of the Complex:**
- The complex consists of a cation and an anion. The cation is `[Co(H2NCH2CH2NH2)3]2+` and the anion is `(SO4)3-`.

2. **Determine the Anion Name:**
- The anion is sulfate, which corresponds to the formula `SO4^2-`.

3. **Calculate the Charge of the Cation:**
- There are three sulfate ions, each with a charge of `-2`, giving a total charge of `-6` from the anions.
- Since the complex is neutral overall, the total charge of the cation must be `+6`.
- The cation is `[Co(H2NCH2CH2NH2)3]`, and since there are two of these cations (as indicated by the subscript 2), the charge on one cation must be `+3`.

4. **Identify the Ligand:**
- The ligand present is ethylenediamine, which can also be written as ethane-1,2-diamine. It is a bidentate ligand (it can form two bonds with the central metal).

5. **Count the Ligands:**
- There are three ethylenediamine ligands in the complex, so we will use the prefix "tris" to indicate this.

6. **Determine the Oxidation State of Cobalt:**
- The oxidation state of cobalt in this complex is `+3`, as calculated earlier.

7. **Construct the Cation Name:**
- The name of the cation will be constructed as follows:
- Ligand name: "tris(ethane-1,2-diamine)"
- Metal name: "cobalt"
- Oxidation state: "(III)"
- Therefore, the cation name is: `tris(ethane-1,2-diamine)cobalt(III)`.

8. **Combine Cation and Anion Names:**
- The full name of the complex will be the name of the cation followed by the name of the anion.
- Thus, the complete name is: `tris(ethane-1,2-diamine)cobalt(III) sulfate`.

### Final Answer:
The correct IUPAC name of the complex `[Co(H2NCH2CH2NH2)3]2(SO4)3` is **tris(ethane-1,2-diamine)cobalt(III) sulfate**.