The reaction
`Cr_2O_3+2AltoAl_2O_3+2Cr` `(triangleG^(ɵ)=-421kJ))`
Is thermodynamically feasible as is apparent from the Gibbs energy value. Why does it not take place at room temperature?

Answer

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

Explanation

this is explained on the basis of `K_(eq)` the equilibrium constant in the given redox reaction , all reactants and products and Hence the reactions does not ovcure sat RT At High temparture Cr Melt and values of TAS increase As a result the value of
`Delta _(t)G^(Theta)` Becomes more nagative an hence the reaction procedds rapidly .