Write the equations for the Van Arkel method used for the refining of Zirconium, the two temperatures being = 870 K and 2070 K.

Explanation

To solve the question regarding the Van Arkel method for refining zirconium, we will outline the process in two main steps, detailing the reactions that occur at the specified temperatures.

### Step-by-Step Solution:

1. **Formation of Zirconium Tetraiodide (ZrI4)**:
- The first step in the Van Arkel method involves the reaction of zirconium metal (Zr) with iodine (I2) to form zirconium tetraiodide (ZrI4).
- The equation for this reaction is:
\[
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