Write two basic requirements for refining of a metal by Mond process and by Van Arkel Method

Explanation

### Step-by-Step Text Solution:

**1. Basic Requirements for Mond Process:**
- **Formation of Volatile Compound:** The metal to be refined, such as nickel, must be able to form a volatile compound when reacted with a suitable reagent, like carbon monoxide. In the case of nickel, it forms nickel tetracarbonyl (Ni(CO)₄).
- **Decomposability of the Compound:** The volatile compound formed must be easily decomposable at a relatively low temperature to allow for the recovery of the pure metal. Nickel tetracarbonyl decomposes upon heating to yield pure nickel.

**2. Basic Requirements for Van Arkel Method:**
- **Formation of Volatile Compound:** The metal, such as germanium or zirconium, must be able to form a volatile compound with a suitable halogen, typically iodine. For example, zirconium forms zirconium iodide (ZrI₄).
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