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Explain: Zn^2+ salts are white while Cu^2+ salts are blue.

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Explain: Zn2+ salts are white while Cu2+ salts are blue. 

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Due to fully-filled d-subshell (3d10) in Zn2+, there is no possibility of d-d transition of electrons & is colourless but Cu2+ has 3d9 electronic configuration, so the electrons are involves in d-d transition & are coloured.

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