The ∆Go is negative for the reduction of Cr2O3 with A1 but the reaction does not take place at room temperature because

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the net value of ∆Gobecomes positive

the orientation of molecules of Al and Cr2O3 is not process

certain amount of activation energy is required to start the reaction

melting point of Cr2O2 is very high so no reaction take place

answer is C.

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Detailed Solution

Several spontaneous reactions also require a certain amount of activation energy to over come the forces of attraction, therefore heating is required.

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