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The principal ore from which alumina is produced is

  • A.limestone
  • B.bauxite
  • C.kaolin
  • D.feldspar

Answer: B

The Bayer process dissolves the alumina from bauxite in caustic soda and precipitates it as hydroxide, which is then calcined. Purity and particle size are both controlled during that sequence. The Bayer process is the same one that feeds aluminium smelting.

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