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Ca(OH)2 + 2HNO3 ---> Ca(NO3)2 + 2H2O
Ca + 2HNO3 ---> Ca(NO3)2 + H2
2K + H2S ---> K2S + H2
2KOH + H2S ---> K2S + 2H2O
K2O + H2S----> K2S + H2O
Ca + 2HCl--- > CaCl2 + H2
CaO +2 HCl ---> CaCl2 + H2O
Ca(OH)2 + 2HCl ---> CaCl2 + 2H2O