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The reaction, Cr(2)O(3)+2AlrarrAl(2)O(3)...

The reaction, `Cr_(2)O_(3)+2AlrarrAl_(2)O_(3)+2Cr(DeltaG^(Theta)=-421KJ)` is the thermodynamically feasible as is apparent from the Gibbs energy value . Why does it not take place at rom temperture?

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Certain amount of activation energy is essential even for such reactions which are thermodynamically feasible, therefore heating is required.
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