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Van Arkel - De Boer Method

Which method ...

Question

Which method of purification is represented by the equations_______.
$\frac{T i}{(i m p u r e)} + 2 I_{2} 500 k - -- \to T i I_{4} 1675 K - --- \to T i + \frac{2 I_{2}}{(p u r e)}$

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 $T i I_{4}$ , leaving behind impurities. The stable volatile compound thus formed is decomposed to get the pure metal.

$\frac{T i}{(i m p u r e)} + 2 I_{2} 500 k - -- \to T i I_{4} 1675 K - --- \to T i + \frac{2 I_{2}}{(p u r e)}$

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