Question
Explain giving reason :
The transition metals generally form coloured compounds.
The transition metals generally form coloured compounds.
✓
Answer
Compounds of transition metals are generally coloured because they contain unpaired electrons which allow d-d transition $\left(t_{2 g}\right.$ to $\left.e_g\right)$ to occur easily by visible light. In the presence of ligand (water etc.) the d orbital splits into two parts $-t_{2 g}$ and eg. For this reason, their colour is observed only in aqueous solution or hydrated state.
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