A) complete ns subshell
B) small size metal ions
C) incomplete \[(n-1)\,d\]subshell
D) absorption of light in UV region
Correct Answer: C
Solution :
Most of the compounds of transition metals are coloured in solid state or solution. This is due to their incomplete\[(n-1)\]\[d-\]subshell. Their colour arises from the excitation of electron from d-orbitals of lower energy to \[d-\]orbitals of higher energy (i.e., d-d transition).
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