Question

Explain why zn^2+ salts are white while cu^2+ salts are blue?

Answer 1

The straight answer is d-d transition in Zn

Let me explain a bit

You have Zn and Cu 2+,

In Zn2+ there is fully filled d orbital so it can't do d-d transition where as in Cu2+ there is one free electron which can do d-d transition and because of that it has a colour.

Thanks.

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