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Bauxite ore is made up of Al₂O₃ + SiO₂ + TiO₂+ Fe₂O₃. This ore is treated with conc. NaOH solution at 500 K and 35 bar pressure for a few hours and filtered hot. In the filtrate, the species present are

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NaAl(OH)₄ and Na₂SiO₃, both

NaAl(OH)₄ only

Na₂Ti(OH)₆ only

Na₂SiO₃only

answer is C.

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Detailed Solution

TiO₂ and Fe₂O₃are basic oxides. So they will not react with NaOH. Al₂O₃ is amphoteric oxide and SiO₂ is acidic oxide. So they will react with NaOH
Al₂O₃+NaOH ⟶ NaAl(OH)₄
SiO₂+NaOH⟶Na₂SiO₃

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