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The reaction, Cr2O3 + 2Al rarr Al2O3 + 2...

The reaction, `Cr_2O_3 + 2Al rarr Al_2O_3 + 2Cr (DeltaG^@ = -421KJ)` is thermodynamically feasible as is apparent from the Gibbs energy value. Why does it not take place at room temperature?

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