Question

Assertion :Copper (II) iodide is unstable even at ordinary temperature. Reason: The $C{u}^{2+}$ ion with a 17-electron outer-shell and a comparatively small radius (0.08 nm) has a strong polarising power, while the iodide ion with a larger radius (r = 0.22 nm) has a high polarisability. Hence, the polarisation of the $I^{-}$ by the $C{u}^{2+}$ leads to the complete transition of an electron from the anion to the cation. The $C{u}^{2+}$ ion is thus reduced to $Cu$ ion and $I^{-}$ is oxidised to free iodine. The compound $Cu{I}_2$ therefore, does not exist.
$2Cu{I}_2⟶2CuI+I_2$
$2I^{-}⟶I_2+2e^{-}$
$C{u}^{2+}+2e^{-}⟶Cu$

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
• C. Assertion is correct but Reason is incorrect.
• D. Both Assertion and Reason are incorrect.

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

The reason explains it pretty well.