a) Ca(OH)2+H2CO3--->CaCO3+2 H2O
Ca+H2CO3--->CaCO3+H2
CaO+H2CO3--->CaCO3+H2O
b) 2 NaOH+H2SO4--->Na2SO4+2 H2O
2 Na+H2SO4--->Na2SO4+H2
Na2O+H2SO4--->Na2SO4+H2O
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Verified answer
a) Ca(OH)2+H2CO3--->CaCO3+2 H2O
Ca+H2CO3--->CaCO3+H2
CaO+H2CO3--->CaCO3+H2O
b) 2 NaOH+H2SO4--->Na2SO4+2 H2O
2 Na+H2SO4--->Na2SO4+H2
Na2O+H2SO4--->Na2SO4+H2O