# The reaction, $Cr_2 O_3 + 2 AI \rightarrow Al_2 O_3 + 2 Cr$     $(\Delta G^{o} = - 421 kJ)$ is thermodynamically feasible as is apparent from the Gibbs energy value. Why does it not take place at room temperature?

$Cr_2 O_3 + 2 AI \rightarrow Al_2 O_3 + 2 Cr$
This reaction is thermodynamically feasible, but it does not take place in room temperature because at room temperature all the reactants are solids. At high temperature, the chromiums start melting and the reaction becomes faster.

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