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The d & f Block Elements — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryThe d & f Block Elements1 Mark
MCQ
$\text{ll Cu(II)}$ halides are known except the iodide. The reason for it is that:
  • A
    iodide is a bulky ion.
  • ✓
    $Cu^{2+}$ oxidizes iodide to iodine.
  • C
    $\text{Cu}^{2+}_\text{(aq)}$ has much more negative hydration enthalpy.
  • D
    $Cu^{2+}$ ion has smaller size.
✓

Answer

Correct option: B.
$Cu^{2+}$ oxidizes iodide to iodine.
All $\text{Cu(II)}$ halides are known except the iodine because $Cu^{2+}$ oxidizes iodine to iodine.
$2 \mathrm{Cu}^{2+}+4 \mathrm{I}^{-1} \rightarrow 2 \mathrm{CuI}_{(\mathrm{S})}+\mathrm{I}_2$.

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