‘Heating a china dish containing copper powder makes the copper powder become coated with a black substance.’ Which of the following equations is a correct translation of the statement?
1
2Cu + O2 → 2CuO + O3
2
2Cu + O2 → 2CuO
3
Fe + CuSO4 → FeSO4 + Cu
4
CuO + H2 → Cu + H2O