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Question
Explain the following.
Cu forms coloured salts while Zn forms colourless salts.
Solution
- Electronic configuration of 29Cu is [Ar] 3d104s1 while that of Zn is [Ar] 3d104s2
- Electronic configuration of Cu in its +1 oxidation state is [Ar] 3d10 while that in +2 oxidation state is [Ar] 3d9.
- Therefore, Cu contains partially filled d orbitals in +2 oxidation state and thus, Cu2+ salts are coloured.
- However, Zn has completely filled d orbital which is highly stable, and hence, it does not form coloured ions.
Hence, Cu forms coloured salts while Zn forms colourless salts.
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