Q20 of 52 Page 80

Which of the following ores are concentrated by froth floation?

Only sulphide ores are concentrated by froth floatation. Galena(PbS) and Copper pyrites(CuFeS2) are sulphide ores while Haematite(Fe2O3) and Magnetite(Fe3O4) are oxides and cannot be concentrated by froth floatation.

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18

In the Froth Floatation process, zinc sulphide and lead sulphide can be separated by ______________.

 19

Common impurities present in bauxite are ____________.

 21

Which of the following reactions occur during calcination?

 22

For the metallurgical process of which of the ores calcined ore can be reduced by carbon?