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Write chemical equations for the reactions taking place when :
(i) Manganese dioxide is heated with aluminium powder.
(ii) Steam is passed over red hot iron.
(i) Manganese dioxide is heated with aluminium powder.
(ii) Steam is passed over red hot iron.
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(i) $\ce{3MnO2(s) + 4Al(s) -> 3Mn(l) + 2Al2O3(s) + Heat}$ (1 Mark)
(ii) $\ce{3Fe(s) + 4 H2O(g) -> Fe3O4(s) + 4H2(g)}$ (1 Mark)
(Balancing is optional)
(ii) $\ce{3Fe(s) + 4 H2O(g) -> Fe3O4(s) + 4H2(g)}$ (1 Mark)
(Balancing is optional)