Van Arkel method of refining zirconium involves

Options

A. removing all oxygen and nitrogran impurites
B. removing CO impurity
C. removing hydrogen impurity
D. removing silica impurity

Explanation

### Step-by-Step Solution for the Question on Van Arkel Method of Refining Zirconium

1. **Understanding the Van Arkel Process**: The Van Arkel method is a chemical process used to purify metals, particularly zirconium. It involves the formation of a volatile compound of the metal.

2. **Formation of Zirconium Tetraiodide**: In the first step, zirconium (Zr) reacts with iodine (I2) at low temperatures to form zirconium tetraiodide (ZrI4). The reaction can be represented as:
\[ \text{Zr} + 2 \text{I}_2 \rightarrow \text{ZrI}_4 \]

3. **Decomposition of Zirconium Tetraiodide**: The zirconium tetraiodide is then heated to a higher temperature. This causes it to decompose back into pure zirconium and iodine:
\[ \text{ZrI}_4 \rightarrow \text{Zr} + 2 \text{I}_2 \]

4. **Removal of Impurities**: During the refining process, impurities such as oxygen and nitrogen, which may be present in the zirconium, are removed. This results in the production of pure zirconium.

5. **Final Product**: The final product of the Van Arkel method is pure zirconium, free from impurities like oxygen and nitrogen.

### Summary of the Process
- The Van Arkel method involves the reaction of zirconium with iodine to form zirconium tetraiodide.
- Heating this compound leads to the release of pure zirconium and iodine, effectively refining the zirconium by removing impurities.