Q.

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 Fe2​O3​ are basic oxides. So they will not react with NaOH. Al2​O3​ is amphoteric oxide and SiO2​ is acidic oxide. So they will react with NaOHAl2​O3​+NaOH ⟶ NaAl(OH)4​SiO2​+NaOH⟶Na2​SiO3​
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