a. 2 Zn + O2 --> 2 ZnO

b. 4 Zn + 2 SO2 --> 4 ZnO + S2
c. Zn + SO2 --> ZnS + O2
d. Zn + I2 --> ZnI2
e. Zn + O2 --> CO2 + H2O
what reactions correspond to each one of this problems