1) 2Ca + O2 = 2CaO
CaO + 2HCl = CaCl2 + H2O
2) 2Zn + O2 = 2ZnO
ZnO + 2HNO3 = Zn(NO3)2 + H2O
Zn(NO3)2 + 2NaOH = Zn(OH)2 + 2NaNO3
Zn(OH)2 + H2SO4 = ZnSO4 + 2H2O
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Answers & Comments
1) 2Ca + O2 = 2CaO
CaO + 2HCl = CaCl2 + H2O
2) 2Zn + O2 = 2ZnO
ZnO + 2HNO3 = Zn(NO3)2 + H2O
Zn(NO3)2 + 2NaOH = Zn(OH)2 + 2NaNO3
Zn(OH)2 + H2SO4 = ZnSO4 + 2H2O