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Why is zinc not extracted from zinc oxid...

Why is zinc not extracted from zinc oxide through reduction using CO?

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Zinc is not extracted from Zinc oxide through reduction by using CO.
Explanatin :
`2Zn+O_(2)rarr2ZnO,DeltaG^(@)=-650kJ`
`2CO+O_(2)rarr2CO_(2),DeltaG^(@)=-450kJ`
`2ZnO+2COrarr2Zn,2CO_(2),DeltaG^(@)=200kJ`
`DeltaG^(@)`=positive indicatis that the reaction is not feasible.
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