KCET2022Chemistryd and f Block Elements
All Cu(II) halides are known, except the iodide, the reason for it is that
Options
- ACu ²⁺ oxidises iodide to iodine
- BCu ²⁺ has much more negative hydration enthalpy
- CCu ²⁺ ion has smaller size.
- Diodide is bulky ion.
Correct answer
A. Cu ²⁺ oxidises iodide to iodine
Step-by-step solution
2 Cu ²⁺+4 I ⁻ 2 CuI ₂ This Cu (II) iodide immediately decomposes to liberate I ₂ and insoluble copper (I) iodide. 2 CuI ₂ 2 CuI + I ₂