Question

1g of copper powder was taken in a China dish and heated. What change takes place on heating?
When hydrogen is passed over this heated substance, a visible change is seen in it. Give the
chemical equations of reactions
​

Answer 1

Answer:

The surface of copper powder becomes coated with black copper II oxide.

If hydrogen gas is passed over the heated material CuO, the black coating on the surface turns brown as the reverse reaction takes place and copper is obtained.

CuO+ H2 --------heat > Cu + H2O

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