Al _2 O _3 can be converted to anhydrous AlCl _3 by heating:-

NEET 2006 Chemistry question

Chemistry General Principles and Processes of Isolation of Elements (Metallurgy)NEET 2006

Not in JEE Main or NEET syllabus

can be converted to anhydrous by heating:-

(1) with HCl gas
(2) with NaCl in solid state
(3)A mixture of and carbon in dry gasCorrect
(4) with gas

Answer: (3)

Solution

Anhydrous is prepared by heating alumina with carbon (coke) in a current of dry chlorine: . Carbon acts as a reducing agent removing oxygen as CO, which makes the reaction

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Question ID VK-089597