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JEE Main Chemistry question

ChemistryGeneral Principles and Processes of Isolation of Elements (Metallurgy)JEE Main

Not in JEE Main or NEET syllabus

Observe the following statements regarding purification of bauxite

I. During Hall's process, silica is removed as Si (vapour). II. Bauxite ore contaminated with is purified in Baeyer's process. III. During Serpeck's process, AlN is formed. The correct answer is [EAMCET 2005]

Answer: (D)

Solution

Hall's process (like Baeyer's process) purifies bauxite contaminated with — the ore is fused with , giving soluble sodium aluminate while remains undissolved; it does not remove silica, so statement I (which attributes silica removal as Si vapour to Hall's process) is false — that

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Question ID VK-138256