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Question

Which method of purification is represented by the equations_______.
Ti(impure)+2I2500k−−−→TiI41675K−−−−→Ti+2I2(pure)

A
Cupellation
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B
Poling
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C
Van Arkel
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D
Zone refining
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Solution

The correct option is C Van Arkel
This is Van-Arkel method.
This method is used for ultrapure metals like Ti, Zr etc. The metal is converted into its volatile stable compound such as TiI4, leaving behind impurities. The stable volatile compound thus formed is decomposed to get the pure metal.

Ti(impure)+2I2500k−−TiI41675K−−−Ti+2I2(pure)

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