Question

why cu2+ is colored while zn2+is white ?

Answer 1

Cu+2 Have Unpaired Electron In His Electron Configuration but Zn+2 Have All Shell with Paired Electron.. [According To Molecular Orbital Theory]

That's Why When Electron Go To Excited State it Emit the Colour and Because Cu+2 have Unpaired Electron It Do So while Zn+2 Can't.

Hope This Gonna Help You

Answer 2

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➡️Cu+2 Have Unpaired Electron In His Electron Configuration but Zn+2 Have All Shell with Paired Electron.

tl➡️. [According To Molecular Orbital Theory]

➡️That's Why When Electron Go To Excited State it Emit the Colour and Because Cu+2 have Unpaired Electron It Do So while Zn+2 Can't.