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Between C and CO, which is a better reducing agent for ZnO?

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Case – I : [Coke as reducing agent]

ZnO + C → Zn + CO,

∆G° becomes lesser as the T is more then 1120K.

Case – II : [CO as reducing agent]

ZnO + CO2 → Zn + CO, ∆G° becomes lesser when the T is more then 1323K.

→ The value of ∆G° is negative for a reaction to occur.

→ In the equation (1)

∆G° becomes negative at low temperature- so equation (1) is feasible i.r. C is a better reducing agent for ZnO.

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