Расставьте коэффициенты и определите тип реакций в схемах уравнений:

а) N2+H2 = NH3 б) Fe2O3 + Al = Fe + Al2O3 в) PbO2=Pb+O2
г) Fe(OH)3 + H2SO4=Fe2(SO4)3 + H2O
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