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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a
NaAl(OH)4 only
b
Na2Ti(OH)6 only
c
NaAl(OH)4 and Na2SiO3, both
d
Na2SiO3 only
answer is C.
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Detailed Solution
TiO2 and Fe2O3 are basic oxides. So they will not react with NaOH. Al2O3 is amphoteric oxide and SiO2 is acidic oxide. So they will react with NaOHAl2O3+NaOH ⟶ NaAl(OH)4SiO2+NaOH⟶Na2SiO3
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