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H2S+H2SO4=SO2+S=H2O

Zn+HNO3=N2+Zn(NO3)2+H2O

AL+BaCO3=BaO+C+AL2O3

AL+H2SO4=S+AL2(SO4)3+H2O

HNO3+HI (Йод)=HI(Йод)O+NO2+H2o
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