JEE Main Chemistry question

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

Not in JEE Main or NEET syllabus

Bauxite ore is made up of Al_2O_3+SiO_2+TiO_2+Fe_2O_3. This ore is treated with conc solution at 500 K and 35 bar pressure for few hours and filtered when hot. In the filtrate, the species present are [DCE 2009]

(A) only
(B) only
(C) and bothCorrect
(D) only

Answer: (C)

Solution

Under hot, concentrated NaOH at high pressure, the amphoteric dissolves as soluble sodium aluminate, (or ), and the reactive silica gangue is likewise attacked by the strong alkali to form soluble

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Question ID VK-145298