Question

Cu forms coloured salts while Zn forms colourless salts. Explain it

Answer 1

Cu forms coloured salts while Zn forms colourless salts because copper is paramagnetic and Zn is diamagnetic.

Explanation:

• It is known that some of the transition element compounds are colored due to the presence of unpaired electrons. For example, electronic configuration of copper is $[Ar]4s^{1}3d^{10}$ and when it forms compound with another element then generally it exists in $Cu^{2+}$ form.

• Hence, copper contains unpaired electrons so, its salt is blue in color. On the other hand, electronic configuration of Zn is $[Ar]4s^{2}3d^{10}$ and it generally exists in $Zn^{2+}$ form.

• Hence, there are no unpaired electrons present in Zn atom. As a result, the salts of zinc are colorless in nature because zinc is diamagnetic, that is, it does not have any unpaired electrons.  

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