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Q. Assertion : Copper$(II)$ iodide is not known.
Reason : $Cu^{2+}$ oxidises $I^-$ to $I_2$.

The d-and f-Block Elements

Solution:

$Cu ^{+2}$ is more stable than $Cu ^{+}$(due to high hydration enthalpy), in case of iodine, $Cu ^{+2}$ oxidizes $I ^{-}$to $I _{2}$.Hence Copper(II) iodide is not known.