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Account for the following facts : The ...

Account for the following facts :
The reduction of `Cr_(2)O_(3)` with Al is thermodynamically feasible, yet it does not occur at room temperature.

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This is due to lack of diffusion of metal through the mass in the solid state at room temperature.
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U-LIKE SERIES-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-LONG ANSWER QUESTIONS-I
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