JEE Main Chemistry question

Not in JEE Main or NEET syllabus

Alumina may be converted into anhydrous aluminium chloride by:

(A)Heating it with conc. HCl
(B)Heating in a current of dry chlorine
(C)Heating it with rock salt
(D)Mixing it with carbon and heating the mixture in a current of dry chlorineCorrect

Answer: (D)

Solution

does not react efficiently with chlorine alone; carbon must be present to remove the oxygen (as CO), driving $ + 3C

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Question ID VK-138629