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General Principles and Processes of Isolation of Elements — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryGeneral Principles and Processes of Isolation of Elements2 Marks
Question
Which method is used for refining Zr and Ti? Explain with equation.
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Answer

Van Arkel method is used for refining Zr and Ti. In this method crude metal is heated with iodine to form volatile unstable compound. The compound is then decomposed to get pure metal.
$\text{Zr}(\text{s})+2\text{I}_{2}\ \xrightarrow{\ \ \ \ \ }\text{ZrI}_{4}$
$\text{ZrI}_{4}\ \xrightarrow{\ \ \ \ \ }\text{Zr}(\text{s})+2\text{I}_{2}$
$\text{Ti}+2\text{I}_{2}\ \xrightarrow{\ \ \ \ \ }\text{TiI}_{4}(\text{g})$
$\text{TiI}_{4}\ \xrightarrow{\ \ \ \ \ \ \ }\text{Ti}+2\text{I}_{2}$

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