[devvaibhav]

Q:- Copper forms two oxides. For the same amount of copper, twice as much oxygen was used to form the first oxide than to form the second one. What is the ratio of the valencies of copper in the first and second oxides?
[Hint: Assume that the oxides are Cu₂O_x and Cu₂O_y]

Do we need to take account of the oxidation number here or there is something else?

[Schrödinger]

Yeah, this is basically about the oxidation states of Copper

[devvaibhav]

thanks .