Rust is

Options

A. A mixture of `Fe_(2)O_(3) and Fe(OH)_(3)`
B. A mixture of `FeO` and `Fe(OH)_(2)`
C. `Fe_(2)O_(3)` only
D. A mixture of `Fe_(2)O_(3).3H_(2)O` and `FeO`

Answer

**Step-by-Step Solution:**

1. **Understanding Rust Formation:**
- Rust is primarily formed when iron reacts with oxygen and moisture in the environment. This process is known as corrosion.

2. **Chemical Reaction:**
- When iron (Fe) is exposed to water (H2O) and oxygen (O2), it undergoes a series of chemical reactions.
- The initial reaction involves iron losing electrons (oxidation) to form ferrous ions (Fe²⁺).

3. **Formation of Ferric Ions:**
- The ferrous ions can further react with oxygen to form ferric ions (Fe³⁺) by losing another electron.

4. **Formation of Rust:**
- The ferric ions (Fe³⁺) can then react with oxygen to form ferric oxide (Fe2O3), and with water to form ferric hydroxide (Fe(OH)3).
- The overall composition of rust is a mixture of ferric oxide and ferric hydroxide.

5. **Conclusion:**
- Therefore, rust is identified as a mixture of Fe2O3 (ferric oxide) and Fe(OH)3 (ferric hydroxide).

**Final Answer:**
- Rust is a mixture of Fe2O3 and Fe(OH)3.

---