Question:
Which refining method involves the reactions I and II shown below? I. \(Zr_{(Impure)} + 2I_2 \rightarrow ZrI_4\) II. \(ZrI_4 \xrightarrow{1800 K} Zr_{(Pure)} + 2I_2\)
Which refining method involves the reactions I and II shown below? I. \(Zr_{(Impure)} + 2I_2 \rightarrow ZrI_4\) II. \(ZrI_4 \xrightarrow{1800 K} Zr_{(Pure)} + 2I_2\)
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The van Arkel process is primarily used for metals that form volatile halides, which decompose upon heating.
Updated On: Jun 9, 2026
- Zone refining
- Mond process
- van Arkel method
- Electrolytic refining
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The Correct Option is C
Solution and Explanation
Concept:
The van Arkel method is a technique used for the ultra-purification of metals like Zirconium (Zr) and Titanium (Ti) based on the principle of thermal decomposition of metal iodides.
Step 1: Analyze the given reactions.
The reactions represent a two-step purification process: 1. Formation of volatile metal iodide at a lower temperature: \[ Zr + 2I_2 \rightarrow ZrI_4 \] 2. Thermal decomposition of the volatile iodide at a higher temperature (1800 K) onto a tungsten filament: \[ ZrI_4 \rightarrow Zr + 2I_2 \]
Step 2: Identify the method.
This specific sequence of forming a volatile iodide and then decomposing it is the definition of the van Arkel method (also known as the iodide process). \[ \boxed{\text{van Arkel method}} \]
Step 1: Analyze the given reactions.
The reactions represent a two-step purification process: 1. Formation of volatile metal iodide at a lower temperature: \[ Zr + 2I_2 \rightarrow ZrI_4 \] 2. Thermal decomposition of the volatile iodide at a higher temperature (1800 K) onto a tungsten filament: \[ ZrI_4 \rightarrow Zr + 2I_2 \]
Step 2: Identify the method.
This specific sequence of forming a volatile iodide and then decomposing it is the definition of the van Arkel method (also known as the iodide process). \[ \boxed{\text{van Arkel method}} \]
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