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Question

Identity the principle behind the concentration of bauxite ore.

A
Magnetic property of impurities in white bauxite
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B
Low specific gravity of Al2O3
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C
Amphoteric nature of Al2O3
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D
High melting point of Al2O3
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Solution

The correct option is C Amphoteric nature of Al2O3
Al2O3+2NaOH+3H2O2Na[Al(OH)4]
Al2O3+6HCl2AlCl3+3H2O
Hence, in both the ways, Al can be concentrated, which owes to its amphoteric nature.

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