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Q.

(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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a

Both (A) and (R) are true but (R) is not the correct explanation of (A)

b

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

c

Both (A) and (R) are false

d

(A) is true but (R) is false

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)
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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