помогите пожалуйста, очень надо)) Ca+S= Zn+PbHl2= Ag+H2SO4 (разбав)= Fe+Pb(NO3)2= Cu+HCl= Mg+Cl2= Ba+HCl= Fe+S= Hg+H2O= Ca+H2O= Fe=HgCl2= Ca+Se=  
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