Carbon cannot be used in reduction og Al2O3 because 1. It is expensive 2. The enthalpy of formation of CO2 is more than that of Al2O3 3 pure carbon is not easily available 4. The enthalphy of formation of Al2O3 Al2O3 is high. Which is the correct option and WHY?

1. The enthalpy of formation of  Al2O3 is very high. The correct option is (d).
2. This is because,Al is very high in reactivity as compared to C and C is not able to reduce it. The energy required is very high  and it cannot be compensated by reduction of C to CO2.

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