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NCERT Class XII Chemistry
Chapter - General Principle of Process of Isolation of Elements
Questions with Solutions

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Question : 30 of 31
Marks: +1, -0
The reaction, Cr2O3+2Al→Al2O3+2Cr\mathrm{Cr_2O_3} + 2\mathrm{Al} \rightarrow \mathrm{Al_2O_3} + 2\mathrm{Cr} (ΔG∘=−421 kJ)(\Delta G^{\circ} = -421\ \mathrm{kJ}) is thermodynamically feasible as is apparent from the Gibbs energy value. Why does it not take place at room temperature?
Solution:  
Certain amount of activation energy is essential even for suchreactions which are thermodynamically feasible, therefore heating isrequired.
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