CuO+H₂=

The reaction between copper(II) oxide (CuO) and hydrogen gas (H₂) is a reduction reaction. When hydrogen gas is used to reduce copper(II) oxide, it produces copper (Cu) and water (H₂O). The balanced chemical equation for this reaction is:

\[ \text{CuO} + \text{H}_2 \rightarrow \text{Cu} + \text{H}_2\text{O} \]

In this reaction, CuO is reduced to Cu while H₂ is oxidized to H₂O.