MCQ
Most copper $(I)$ compounds are found to be colourless. This is due to:
- APresence of low oxidation state of copper.
- ✓Completely filled $d-$level in $Cu(I).$
- CDiamagnetic nature of the compound.
- DHigh polarizability of $Cu(I)$ ion.
✓
Answer
Correct option: B.
Completely filled $d-$level in $Cu(I).$
In copper $(I)$ ion there are no vacant $d$ orbitals as it is diamagnetic. Copper$(I)$ ion being less charged has small ligand field effect and the transition is in the infrared region in which no color is perceived by human eye.
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