Q.

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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a

the net value of ∆Gobecomes positive

b

the orientation of molecules of Al and Cr2O3 is not process

c

certain amount of activation energy is required to start the reaction

d

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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