Bauxide ore is made up of `Al_(2)O_(3) + SiO_(2) + TiO_(2) + Fe_(2) O_(3)`. 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 areA. `NaAl(OH)_(4)` onlyB. `Na_(2)Ti(OH)_(6)` onlyC. `NaAl(OH)_(4)andNa_(2)SiO_(3)` bothD. `Na_(2)SiO_(3)` only

Bauxide ore is made up of `Al_(2)O_(3) + SiO_(2) + TiO_(2) + Fe_(2) O_

1.	Bauxide ore is made up of `Al_(2)O_(3) + SiO_(2) + TiO_(2) + Fe_(2) O_(3)`. 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 areA. `NaAl(OH)_(4)` onlyB. `Na_(2)Ti(OH)_(6)` onlyC. `NaAl(OH)_(4)andNa_(2)SiO_(3)` bothD. `Na_(2)SiO_(3)` only
Answer» Correct Answer - A In buxine ore, only `Al_(2)O_(3)` reacts with conc. NaOH and formed sodium meta aluminate. This, further dissolves in water `Al_(2)O_(3) +2H_(2)O +2NaOH underset(35 "bar")overset(500 K)rarr2NaAlO_(2) +3H_(2)O` `NaAlO_(2)+2H_(2)O to NaAl(OH)_(4)`

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