CO is a reducing agent, Fe3O4 is an oxidizing agent.
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Reactants:
CO – Carbon monoxide
Other names: Carbon monooxide, Carbonous oxide, Carbon(II) oxide
Appearance: Colorless gas ; Odourless tasteless colourless compressed gas ; Colorless, odorless gas. [Note: Shipped as a nonliquefied or liquefied compressed gas.]
Fe3O4 – Iron(II) iron(III) oxide
Other names: Iron(II,III) oxide, Ferrous ferric oxide, Ferroso ferric oxide
Appearance: Solid black powder
Products:
CO2
Names: Carbon dioxide, {{plainlist|, CO2
Appearance: Colorless gas ; Odourless colourless compressed liquefied gas ; Colorless, odorless gas. [Note: Shipped as a liquefied compressed gas. Solid form is utilized as dry ice.]