Which one of the following reactions is not possible?
- A$Fe + H_2SO_4 \to FeSO_4 + H_2$
- B$Cu + 2AgNO_3 \to Cu(NO_3)_2 + 2Ag$
- C$2KBr + I_2 \to 2KI + Br_2$
- D$CuO + H_2 \to Cu + H_2O$
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