К какому классу веществ относятся: CaO,H2S,NaCl,Ca3(PO4)2,N2O5,AgNO3,Mg,FeSO4,HNO3,K2SiO3,Na2O,H2SO4,K3PO4,PbS,P2O5,H2CO3,ZnSO4,Cu,H2SO3,ZnCl2,BaO,Ba,SO3,K3PO4,HNO3,CaS,Hg(NO3)2,HgCl2,BaSO4,MgO,Na2SO4,CO2,CaSiO3,H3PO4,Ca,SO2,Mg3(PO4)2,H2SiO3,Fe,H2SO4,Pb(NO3)2,K2CO3
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