CO is a reducing agent, ZnO is an oxidizing agent.
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Reactants:
ZnO
Names: Zinc oxide, Zinc white, Calamine
Appearance: White solid ; White powder ; White, odorless solid.
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.]
Products:
Zn
Names: Zinc, Zinc powder (pyrophoric), Zn
Appearance: Grey-to-blue powder
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.]