1. Ba+O2=BaO2
BaO2+Ba=BaO
BaO+H2O=Ba(OH)2
Ba(OH)2+H2SO4=BaSO4↓+2H2O
2. 2Cu+O2=2CuO
CuO+2HCl=CuCl2+H2O
CuCl2+2KOH=2KCl+Cu(OH)2↓
Cu(OH)2+2HNO3=Cu(NO3)2+2H2O
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Answers & Comments
1. Ba+O2=BaO2
BaO2+Ba=BaO
BaO+H2O=Ba(OH)2
Ba(OH)2+H2SO4=BaSO4↓+2H2O
2. 2Cu+O2=2CuO
CuO+2HCl=CuCl2+H2O
CuCl2+2KOH=2KCl+Cu(OH)2↓
Cu(OH)2+2HNO3=Cu(NO3)2+2H2O