(A) During leaching of Al from bauxite seeding agent freshly prepared hydrated Al2O3 is added(R) Seeding agent induces precipitation of Al2O3. x H2O

The principal ore of aluminium, bauxite, usually contains SiO2, iron oxides and titanium oxide (TiO2) as impurities. Concentration is carried out by digesting the powdered ore with a concentrated solution of NaOH at 473 – 523 K and 35 – 36 bar pressure. This way, Al2O3 is leached out as sodium aluminate (and SiO2 too as sodium silicate) leaving the impurities behind Al2O3(s) + 2NaOH(aq) + 3H2O(l) → 2Na[Al(OH)4](aq)

(A) During leaching of Al from bauxite seeding agent freshly prepared hydrated Al2O3 is added(R) Seeding agent induces precipitation of Al2O3. x H2O

The principal ore of aluminium, bauxite, usually contains SiO2, iron oxides and titanium oxide (TiO2) as impurities. Concentration is carried out by digesting the powdered ore with a concentrated solution of NaOH at 473 – 523 K and 35 – 36 bar pressure. This way, Al2O3 is leached out as sodium aluminate (and SiO2 too as sodium silicate) leaving the impurities behind Al2O3(s) + 2NaOH(aq) + 3H2O(l) → 2Na[Al(OH)4](aq)

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(A) During leaching of Al from bauxite seeding agent freshly prepared hydrated Al₂O₃ is added
(R) Seeding agent induces precipitation of Al₂O₃. x H₂O

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Both (A) and (R) are true and (R) is the correct explanation of (A)

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answer is A.

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Detailed Solution

The principal ore of aluminium, bauxite, usually contains SiO₂, iron oxides and titanium oxide (TiO₂) as impurities.
Concentration is carried out by digesting the powdered ore with a concentrated solution of NaOH at 473 – 523 K and 35 – 36 bar pressure.
This way, Al₂O₃ is leached out as sodium aluminate (and SiO₂ too as sodium silicate) leaving the impurities behind
Al₂O₃(s) + 2NaOH(aq) + 3H₂O(l) → 2Na[Al(OH)₄](aq)