Расставьте коэффициенты, преобразовав схемы в уравнение реакций а) Fe2O3 + H2 => H2O + Fe
Б) PbO + Al => Al2O3 + Pb
в) Cr2O3 + Mg => MgO + Cr
г) Al + H20 => Al(OH)3 + H2
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