Question

Zn salts are white while Cu2+ salts are coloured. WHY?

Answer 1

The Zn salts are white because this transition element has no free electron in d-orbital , so by this there is no d-d transitions hence it does not show color . While Cu2+ salts are coloured since according to there electronic configuration it has free electrons which show color due to  d-d transition .

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Answer 2

Heya....
See above attachment for the answer...