a. Zn, Fe3O4
\(Zn+2HCl--->ZnCl_2+H_2\uparrow\)
\(Fe_3O_4+8HCl--->FeCl_2+2FeCl_3+4H_2O\)
b. H2SO4, Zn, SO2
\(H_2SO_4+2NaOH--->Na_2SO_4+2H_2O\)
\(Zn+2NaOH--->Na_2ZnO_2+H_2\uparrow\)
\(SO_2+NaOH--->NaHSO_3\)
c. Zn, Ba(NO3)2
\(Zn+CuSO_4--->Cu\downarrow+ZnSO_4\)
\(Ba\left(NO_3\right)_2+CuSO_4--->BaSO_4\downarrow+Cu\left(NO_3\right)_2\)
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a) Zn, Fe3O4
Zn + 2HCl --> ZnCl2 + H2
Fe3O4 + 8HCl --> FeCl2 --> 2FeCl3 + 4H2O
b) H2SO4, Zn, SO2
2NaOH + H2SO4 --> Na2SO4 + 2H2O
2NaOH +Zn --> Na2ZnO2 + H2
SO2 + 2NaOH --> Na2SO3 +H2O
c) Zn, Ba(NO3)2
Zn + CuSO4 --> ZnSO4 + Cu
Ba(NO3)2 + CuSO4 --> Cu(NO3)2 + BaSO4\(\downarrow\)
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