The IUPAC name of the complex `[Co(SO_(4))(NH_(3))_(4)]NO_(3)` is :

Options

A. Cobalt(III)sulphatotetroaminine nitrate
B. Tetraamminesulphatocobalt(III) nitrate
C. Tetraaminesulphatocobalt(II) nitrate
D. Tetraammoniasulphatecobalt(III) nitrate

Explanation

To determine the IUPAC name of the complex \([Co(SO_4)(NH_3)_4]NO_3\), we will follow these steps:

### Step 1: Identify the components of the complex
The complex consists of:
- Cobalt (Co)
- Sulfate ion \((SO_4)^{2-}\)
- Ammonia ligands \((NH_3)\)

### Step 2: Determine the oxidation state of cobalt
Let \(x\) be the oxidation state of cobalt. The overall charge of the complex ion is +1 (due to the nitrate ion outside the complex). The sulfate ion has a charge of -2, and ammonia is neutral.

The equation can be set up as follows:
\[ x + (-2) + 0 = +1 \]
Solving for \(x\):
\[ x - 2 = 1 \implies x = 3 \]
Thus, the oxidation state of cobalt is +3.

### Step 3: Name the ligands
- The ammonia ligand is named "ammine."
- The sulfate ion is named "sulfato."

### Step 4: Count the number of each ligand
There are four ammonia ligands, which is indicated by the prefix "tetra-":
- Tetraammine for four ammonia ligands.
- Sulfato for the sulfate ion.

### Step 5: Combine the names of the ligands
When naming the ligands, they are listed in alphabetical order:
- "Ammine" comes before "sulfato."

Thus, we write:
- Tetraammine
- Sulfato

### Step 6: Name the metal with its oxidation state
The metal cobalt with its oxidation state of +3 is named as "cobalt(III)."

### Step 7: Name the outer ion
The outer ion is nitrate, which is simply named "nitrate."

### Step 8: Combine all parts to form the complete name
The complete IUPAC name of the complex is:
\[ \text{Tetraammine sulfato cobalt(III) nitrate} \]

### Final Answer
The IUPAC name of the complex \([Co(SO_4)(NH_3)_4]NO_3\) is **Tetraammine sulfato cobalt(III) nitrate**.

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