$Z n^{2 +}$ salts are white while $C u^{2 +}$ salts are coloured. Why?

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Solution

The electronic configuration of $Z n^{2 +}$ and $C u^{2 +}$ can be given as follow:
$Z n^{2 +}$ : $[A r] 3 d^{10}$
$C u^{2 +}$ : $[A r] 3 d^{9}$
Here $C u^{2 +}$ has one unpaired electron while $Z n^{2 +}$ have all paired electrons.
In d-block elements, the element which has an unpaired electron shows colour.
Thus $C u^{2 +}$ show colour.

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