Explain why compounds of Cu2+ are coloured but those of Zn2+ are colou

1.	Explain why compounds of Cu2+ are coloured but those of Zn2+ are colourless.
Answer» Cu (Z = 29) Electronic configuration is [Ar] 3d¹⁰4s¹ Cu : Electronic configuration is [Ar] 3d⁹ . In Cu²⁺ , promotion of electrons take place in outer dorbital by the absorption of light form visible region involves d-d transition. Due to this Cu²⁺ compounds are coloured. Where in Zn²⁺ electronic configuration is [Ar]3d¹⁰. It has completely filled d-orbital. So there is no chance of d – d transition. So Zn²⁺ compounds are colourless.

Explain why compounds of Cu2+ are coloured but those of Zn2+ are colourless.

Answer»

Cu (Z = 29) Electronic configuration is [Ar] 3d¹⁰4s¹

Cu : Electronic configuration is [Ar] 3d⁹ . In Cu²⁺ , promotion of electrons take place in outer dorbital by the absorption of light form visible region involves d-d transition. Due to this Cu²⁺ compounds are coloured. Where in Zn²⁺ electronic configuration is [Ar]3d¹⁰. It has completely filled d-orbital.

So there is no chance of d – d transition. So Zn²⁺ compounds are colourless.

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Explain why compounds of Cu2+ are coloured but those of Zn2+ are colourless.

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