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0 0 +2-2
B) Fe + 2HCl ---> FeCl2 + H2
0 +1-1 +2-1 0
C) Zn + NiSO4 ---> ZnSO4 + Ni
0 +2+6-2 +2+6-2 0
D) Fe2O3 + 6HCl ---> 2FeCl3 + 3H2O bkn redok
3+ -2 +1-1 +3-1 +1-2
E) Ag + 2HNO3 ---> AgNO3 + NO2 + H2O