Which process of purification is represented by the following scheme $\mathrm{Ti}_{\text{impure}} + 2\mathrm{I}_2 \xrightarrow{250^\circ \mathrm{C}} \mathrm{TiI}_4 \xrightarrow{1400^\circ \mathrm{C}} \mathrm{Ti}_{\text{pure}} + \mathrm{I}_2$
AVan-Arkel process
BCupellation
CElectrolytic refining
DZone refining
Answer & Solution
Correct answer: A. Van-Arkel process
This purification involves formation of a volatile iodide of titanium at lower temperature and its decomposition at high temperature to deposit pure metal. That is the iodide process, also called the Van-Arkel process.
The given reaction is:
$$\mathrm{Ti}_{\text{impure}} + 2\mathrm{I}_2 \xrightarrow{250^\circ \mathrm{C}} \mathrm{TiI}_4$$
$$\mathrm{TiI}_4 \xrightarrow{1400^\circ \mathrm{C}} \mathrm{Ti}_{\text{pure}} + \mathrm{I}_2$$
Among the options, this matches $\text{Van-Arkel process}$.
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