1.

Cu^(2+) ions are coloured but Zn^(2+) ions are colourless. Give reason.

Answer»

Solution :`CU^(2+)` ions CONTAIN one unpaired electron in its d-subshell and can undergo d-d TRANSITION. Therefore it is COLOURED.
In `ZN^(2+)`, there is no unpaired electrons, hence it does not undergo d-d transition. Hence it is colourless


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