JEE Main Chemistry question
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 500K and 35 bar pressure for a few hours and filtered hot. In the filtrate the species present are [DCE 2009]
Answer: (A)
Solution
Under Bayer-process conditions, only the amphoteric dissolves in hot concentrated NaOH, forming sodium aluminate which further hydrates to in solution: $ + 2NaOH + → +
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