Расставьте коэффиценты и определите тип реакций в схемах уравнений:
а) Al + S = Al2S3
б)N2 + H2 = NH3
в) Fe2O3 + Al = Fe + Al2O3
г)PbO2 = Pb + O2
д)Ca(OH)2 + HNO3 = Ca(NO3)2 + H20
е)Fe(OH)3 + H2SO4 = Fe2(SO4)3 + H2O
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