a) 2NaOH+H2CO3--->Na2CO3+2H2O
2Na+H2CO3--->Na2CO3+H2
Na2O+H2CO3--->Na2CO3+H2O
Na2O+CO2--->Na2CO3
b) Ca+2HCl--->CaCl2+H2
Ca(OH)2+2HCl--->CaCl2+2H2O
CaO+2HCl--->CaCl2+H2O
Ca+Cl2--->CaCl2
c) Zn+2HBr--->ZnBr2+H2
Zn(OH)2+2HBr--->ZnBr2+2H2O
ZnO+2HBr--->ZnBr2+H2O
Zn+Br2--->ZnBr2
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a) 2NaOH+H2CO3--->Na2CO3+2H2O
2Na+H2CO3--->Na2CO3+H2
Na2O+H2CO3--->Na2CO3+H2O
Na2O+CO2--->Na2CO3
b) Ca+2HCl--->CaCl2+H2
Ca(OH)2+2HCl--->CaCl2+2H2O
CaO+2HCl--->CaCl2+H2O
Ca+Cl2--->CaCl2
c) Zn+2HBr--->ZnBr2+H2
Zn(OH)2+2HBr--->ZnBr2+2H2O
ZnO+2HBr--->ZnBr2+H2O
Zn+Br2--->ZnBr2