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Question

is the principle ore of aluminium and is concentrated by process.

A
Bauxite
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B
Bayer's
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C
Cassiterite
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D
Froth flotation
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Solution

The correct options are
A Bauxite
B Bayer's

Bauxite, Al2O3.2H2O, is the principle ore of aluminium.
Bayer's process is used to concentrate this ore. The reactions involved are given below-
Al2O3.2H2O(s)+NaOH(aq)2NaAlO2(aq)+3H2O(l)
2NaAlO2(aq)+2H2O(l)NaOH(aq)+Al(OH)3(s)
Al(OH)3(s)Al2O3(s)+3H2O(l)

- Fe2O3 and SiO2 are present as impurities.
-Bauxite being amphoteric reacts with conc.NaOH and forms sodium aluminate (NaAlO2).
- SiO2 reacts with NaOH to form soluble sodium silicate (Na2SiO3) while Fe2O3 remains unaffected.
-The impurities are then filtered out. The filtrate contains NaAlO2 and Na2SiO3.
-Small amount of freshly prepared Al(OH)3 is added which hydrolyses NaAlO2 and precipitates white Al(OH)3
- Al(OH)3 ppt is calcined to get Al2O3.


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