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Answer the following.
Cu²⁺ and Fe³⁺ generally form coloured compounds.
$\text{Cu}^{2+}$ and $\text{Fe}^{3+}$ generally form coloured compounds.
Answer
Answer
Because $\mathrm{Cu^{2+}}$ ($3d^9$) and $\mathrm{Fe^{3+}}$ ($3d^5$) have partly filled $d$ orbitals; they absorb light of some visible wavelength for $d$-$d$ transitions and show the complementary colour.