Van Arkel method of purification of metals involves converting the metal to a :

volatile compound

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volatile unstable compound

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non-volatile stable compound

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none of these

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Solution

The correct option is A volatile compound
Van-Arkel 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 the impurities. The stable volatile compound thus formed is decomposed to get the pure metal.

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

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Similar questions

	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

+ I_{2} \to

H e a t - -- \to

+ I_{2}

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