''Chile saltpeter'' is an ore of

Options

A. Iodine
B. Sodium
C. Bromine
D. Magnesium

Answer

To solve the question "Chile saltpeter" is an ore of, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Chemical Formula**:
- Chile saltpeter is known chemically as sodium nitrate. Its chemical formula is NaNO3.

2. **Determine the Elements Present**:
- The chemical formula NaNO3 indicates that it contains sodium (Na), nitrogen (N), and oxygen (O).

3. **Identify the Main Element**:
- Among the elements present in sodium nitrate, the primary element that is often referred to when discussing ores is sodium (Na).

4. **Conclude the Answer**:
- Therefore, "Chile saltpeter" is an ore of sodium.

### Final Answer:
- Chile saltpeter is an ore of **Sodium (Na)**.