Q. Carbon cannot be used in the reduction of $Al_{2}O_{3}$ because
A) It is an expensive proposition
B) The enthalpy of formation of $CO_{2}$ is more than that of $Al_{2}O_{3}$
C) Pure carbon is not easily available
D) The enthalpy of formation of $Al_{2}O_{3}$ is too high
Explanation
(d)
The enthalpy of formation of $Al_{2}O_{3}$ is very high and hence, it is not possible to reduce it by carbon.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.