Carbon cannot be used in the reduction of Al_2O_3 because [Manipal 2010]

JEE Main Chemistry question

Chemistry General Principles and Processes of Isolation of Elements (Metallurgy)JEE Main

Not in JEE Main or NEET syllabus

Carbon cannot be used in the reduction of because [Manipal 2010]

(A)It is an expensive proposition
(B)The enthalpy of formation of is more than that of
(C)Pure carbon is not easily available
(D)The enthalpy of formation of is too highCorrect

Answer: (D)

Solution

has an extremely high (very negative) enthalpy of formation, making it thermodynamically very stable, so carbon cannot supply enough reducing power to liberate aluminium from it. Cost and availability of carbon are

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Question ID VK-138285