# 22. Out of C and CO, which is a better reducing agent for ZnO ?

The Gibbs free energy formation of $CO_{2}$ from  $CO$ is always higher than the Gibbs free energy of formation of $ZnO$. Thus CO cannot reduce $ZnO$.
On the other hand, Gibbs free energy of formation of $CO_{2}$ from C is less than gibbs free energy of formation of $ZnO$. Hence C can easily reduce $ZnO$ to zinc.

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