Reaction between Iron (III) Oxide and CO?
The reaction products depends on stoichiometric ratio of the reactants as well as reaction conditions (i.e temperature, pressure etc.)


$$\ce{Fe2O3 + CO -&gt;[500-600 C] 2FeO + CO2}$$



  Iron(III) oxide and carbon monoxide to produce iron(II) oxide and
  carbon dioxide. This reaction takes place at a temperature of
  500-600°C. (source)



$$\ce{3Fe2O3 + CO -&gt;[400 C] 2Fe3O4 + CO2}$$



  Iron(III) oxide react with carbon monoxide to produce iron(II,III)
  oxide and carbon dioxide. This reaction takes place at a temperature
  near 400°C. (source)



$$\ce{Fe2O3 + 3CO -&gt;[700 C] 2Fe + 3CO2}$$



  Iron(III) oxide react with carbon monoxide to produce iron and carbon
  dioxide. This reaction takes place at a temperature near 700°C. (source)