a) Ca(OH)2 + 2HNO2 = Ca(NO2)2 + 2H2O
б) 4P+5O2=2P2O5
в) Ba + 2H2O = Ba(OH)2 + H2↑
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a) Ca(OH)2 + 2HNO2 = Ca(NO2)2 + 2H2O
б) 4P+5O2=2P2O5
в) Ba + 2H2O = Ba(OH)2 + H2↑