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Give reasons for the following.
Salts of cuprous ( ) ion are colourless whereas the salts of cupric ( ) ion are coloured.
Salts of cuprous ($\text{Cu}^+$) ion are colourless whereas the salts of cupric ($\text{Cu}^{2+}$) ion are coloured.
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From ISC 2024 Specimen Chemistry Paper 1, question 5(i).