Which selection is the correct formula for the chlorate ion?

Options

A. `ClO_(3)^-`
B. `ClO^-`
C. `Cl^-`
D. None of the above

Answer

To determine the correct formula for the chlorate ion, we need to analyze the options provided and understand the chemical composition of the chlorate ion.

### Step-by-Step Solution:

1. **Identify the Ion in Question**: The question asks for the formula of the chlorate ion. The chlorate ion is a polyatomic ion containing chlorine and oxygen.

2. **Recall the Composition of Chlorate Ion**: The chlorate ion is known to contain one chlorine atom and three oxygen atoms. Its chemical formula is ClO₃.

3. **Determine the Charge of Chlorate Ion**: The chlorate ion carries a negative charge. Therefore, the full formula for the chlorate ion is ClO₃⁻.

4. **Review the Options**: The options provided are:
- A) ClO₃⁻
- B) ClO⁻
- C) Cl⁻
- D) None of the above

5. **Evaluate Each Option**:
- **Option A (ClO₃⁻)**: This is the correct formula for the chlorate ion.
- **Option B (ClO⁻)**: This represents the hypochlorite ion, not the chlorate ion.
- **Option C (Cl⁻)**: This is the formula for the chloride ion, which is different from the chlorate ion.
- **Option D (None of the above)**: This is incorrect since we have identified the correct formula.

6. **Conclusion**: The correct formula for the chlorate ion is ClO₃⁻, which corresponds to option A.

### Final Answer:
The correct formula for the chlorate ion is **ClO₃⁻** (Option A).