Out of the oxides given below, which of them cannot be reduced by H_(2) I (Al_(2)O_(3)) ,II (CuO), (III)(ZnO)

Out of the oxides given below, which of them cannot be reduced by H_(2

1.	Out of the oxides given below, which of them cannot be reduced by H_(2) I (Al_(2)O_(3)) ,II (CuO), (III)(ZnO)
Answer» only I I and II I,II, and III III and II. Answer :A