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Which method of purification is represented by the following equations `Ti +2I_(2) overset(523K)rarr TiI_(4) overset(1700K)rarr Ti +2I_(2)`

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Which method of purification is represented by the following equations
`Ti +2I_(2) overset(523K)rarr TiI_(4) overset(1700K)rarr Ti +2I_(2)`
A. Cupellation
B. Poling
C. van Arkel
D. zone refining.
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van Arkel method . `Ti`and `Zn` refined by this method. It is used for obtaining ultra pure metals.
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