The correct option is B The reaction is feasible
The free energy of formation of alumina is more negative than Cr2O3 . According to thermodynamics if ΔG0, is more negative then reaction is more fealible.
Free energy of formation of Al2O3=−827 kJ mol−1
43Al+O2→23Al2O3 ΔGf=−827 kJ mol−1
Free energy of formation of Cr2O3=−540 kJ mol−1
So, 23Cr2O3→43Cr+O2 ΔGf=540 kJ mol−1
Hence the free energy of reaction between Al and Cr2O3
2Al+Cr2O3→Al2O3+2Cr
ΔG0=−827+540=−287 kJ mol
Hence the reaction is feasible.