3 Fe(s) + 4 CO2(g)  -------Fe3O4(s) + 4 CO(g) Keq =   . (b) Fe2O3(s) + 6 HCl(g)  ------2 FeCl3(s) + 3 H2O(g) Keq =   . (c) 2 NO(g) + Cl2(g) ----- 2 NOCl(g) Keq =   .

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