JEE Main Chemistry question

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

Not in JEE Main or NEET syllabus

For purification of alumina, the modern processes most useful when (i) the impurity present is a lot of iron oxides and (ii) the impurity present is a lot of silica, are

(A)For (i) Hall's process; for (ii) Baeyer's process
(B)For (i) Serpeck's process; for (ii) Baeyer's process
(C)For (i) Hall's process; for (ii) Serpeck's process
(D)For (i) Baeyer's process; for (ii) Serpeck's processCorrect

Answer: (D)

Solution

Baeyer's process is the modern method used when bauxite is chiefly contaminated with iron oxide, while Serpeck's process (forming AlN, later hydrolysed) is used when the chief impurity is silica.

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Question ID VK-138332