Copper(II) oxide reacts with iron. The equation for the reaction is shown.
$3CuO + 2Fe \to 3Cu + F{e_2}{O_3}$
Why can this reaction be described as the reduction of copper(II) oxide?
1 )
Iron gains oxygen.
The copper(II) oxide loses oxygen.
3 )
The copper(II) oxide weighs less after the reaction than before.
4 )
There are fewer substances on the right of the equation.
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