The complex pentaaminecarbonatocobalt(III) chlorides is :

Options

A. `[Co(NH_(3))_(5)CO_(3)]Cl`
B. `[Co(NH_(2))_(5)CO_(3)]Cl`
C. `[Co(NH_(2))_(5)CO_(2)]Cl`
D. `[Co(NH_(3))_(5)CO_(2)]Cl`

Answer

To determine the formula of the complex pentaaminecarbonatocobalt(III) chloride, we can follow these steps:

### Step 1: Identify the Central Metal Ion
The central metal ion in this complex is cobalt (Co).

**Hint:** Look for the metal mentioned in the name of the complex.

### Step 2: Determine the Oxidation State of the Metal
The name indicates that cobalt is in the +3 oxidation state (indicated by the Roman numeral III).

**Hint:** The oxidation state is often indicated in the name of the complex using Roman numerals.

### Step 3: Identify the Ligands
The ligands in this complex are:
- Pentaamine: This indicates there are five amine (NH3) ligands.
- Carbonate: This indicates one carbonate (CO3) ligand.

**Hint:** Ligands are usually mentioned in the name of the complex, and their count is indicated by prefixes like "penta-" for five.

### Step 4: Determine the Charges of the Ligands
- Amine (NH3) is a neutral ligand, so it has a charge of 0.
- Carbonate (CO3) has a charge of -2.

**Hint:** Check the common charges of ligands; neutral ligands do not contribute to the overall charge.

### Step 5: Calculate the Overall Charge of the Complex
The overall charge of the complex can be calculated as follows:
- Charge from cobalt = +3
- Charge from five amine ligands = 5 × 0 = 0
- Charge from one carbonate ligand = -2

Thus, the total charge of the complex is:
\[ +3 + 0 - 2 = +1 \]

**Hint:** Add the charges of the metal and ligands to find the overall charge of the complex.

### Step 6: Determine the Counter Ion
To balance the +1 charge of the complex, there must be one chloride ion (Cl-) as a counter ion, which has a charge of -1.

**Hint:** The counter ion is added to balance the overall charge of the complex.

### Step 7: Write the Formula of the Complex
The formula can be written as:
\[ \text{[Co(NH}_3\text{)}_5\text{(CO}_3\text{)]Cl} \]

**Hint:** The ligands are enclosed in brackets, and the counter ion is written outside the brackets.

### Conclusion
The complex pentaaminecarbonatocobalt(III) chloride is represented by the formula:
\[ \text{[Co(NH}_3\text{)}_5\text{(CO}_3\text{)]Cl} \]

### Final Answer
The correct option is:
\[ \text{[Co(NH}_3\text{)}_5\text{(CO}_3\text{)]Cl} \]