реакции разбавленной серной кислоты с цинком соответствует уравнение:
 1. 3Zn+4H2SO4=3ZNSO4+S4H2O
2. 4ZN+5H2SO4=4ZNSO4+H2S+4H20
3. ZN+H2SO4=ZNSO4+H2
 4.  ZN+2H2SO4=ZNSO4+SO2+2H20
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