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  4. All Cu (II) halides are known except the iodide. The reason for it is that

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Q. All $Cu$ (II) halides are known except the iodide. The reason for it is that

J & K CETJ & K CET 2011The d-and f-Block Elements

Solution:

$2Cu^{2+} + 41^- \to 2CuI_2$
The $Cul_2$ immediately decomposes to liberate $I_2$ and insoluble copper$(I)$ iodide.
$2CuI_2 \to 2CuI + I_2$