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2NaOH + H2S -> Na2S + 2H2O
2) CaO + H2CO3 -> CaCO3 + H2O
Na2O + H2S -> Na2S + H2O
3) CO2 + Ca(OH)2 -> CaCO3 + H2O
4)CaO + CO2 -> CaCO3
5) Ca + H2CO3 -> CaCO3 + H2
2Na + H2S -> Na2S + H2
6) 2Na + S -> Na2S
7) CaCl2 + K2CO3 -> CaCO3 + 2KCl
2Na3PO4 + 3BaS -> 3Na2S + Ba3(PO4)2