In the purification of zirconium by van Arkel process which halogen is used?

Fluorine

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Chlorine

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Bromine

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Iodine

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Solution

The correct option is D Iodine
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.

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

So in the purification of Zirconium by van Arkel process iodine is used.

Suggest Corrections

	Column I		Column II
(A)	Impure metal to volatile complex	(i)	Blistered copper
(B)	$2 C u O + C u_{2} S \to 4 C u + S O_{2}$	(ii)	Mond process
(C)	Purification of mercury	(iii)	Van Arkel process
(D)	Purification of zirconium	(iv)	Liquation