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Calculate equivalent weight of Cu in CuO...

Calculate equivalent weight of `Cu` in `CuO` and `Cu_(2)O`. At.wt. of `Cu=63.6`.

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In `Cu^(+)` ion `(d^(10))` there is no `d-d**` trantion and the ion is colourless. Both `Cu_(2)O` and `Cu_(2)S` are coloured because of charge transfer of electrons from `O_(2-)` or `S^(2-)` to the vacant orbital of `Cu^(+)` ion.
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