Which does not represent correct method?

T i C l_{4} + 2 M g Δ - \to T i + 2 M g C l_{2}

: Kroll process

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N i (C O)_{4} Δ - \to N i + 4 C O

: Mond's process

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P b I_{2} Δ - \to P b + I_{2}

: Van arkel process

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Z r I_{4} Δ - \to Z r + 2 l_{2}

: Van arkel process

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Solution

The correct option is A $P b I_{2} Δ - \to P b + I_{2}$ : Van arkel process
Van - Arkel method:
$T i (s) + 2 l_{2} (g) 523 K - -- \to T i l_{4} (g) 1700 K - --- \to T i (s) + 2 l_{2} (g)$
This method is used for $Z r, T i$ and $H f$ .
Option C represents an incorrect method.

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