Question

on heating copper powder in air , the surface of copper gets coated with black coating of oxide. how can this black coating be converted into brown copper again? write chemical equation for both indicate the substance oxide and reduced in each case​

Answer 1

On heating copper powder in air, the surface of copper powder becomes coated with black CuO. How can this black coating be converted into brown copper ? ... Hydrogen gas is passed through the black copper oxide and as a result, it gets reduced to copper which is brown in colour