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In the extraction of zinc, during roasti...

In the extraction of zinc, during roasting the temperature is kept above 850°C and air current must be controlled because:-

A

A. Impurities present will be oxidised and interfere in the reduction

B

B. Zinc sulphide will converted in to `ZnSO_4` which converts back into ZnS during carbon reduction

C

C. In fact roasting is done in controlled supply of air

D

D. Since the roasting is exothermic, temperature inside the converter is to be controlled

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BRILLIANT PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS -LEVEL - II
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  6. Which of the following statements is false?

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  7. From copper pyrite, copper is extracted in two stages. In the reverber...

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  8. During the extraction copper by bessemersiation, bessemer converter is...

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  9. In the extraction of zinc, during roasting the temperature is kept abo...

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  10. In thermite reduction Al is chosen as reducing agent because,

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  11. In thermite reduction, ignition mixture consists of

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  12. In hydrometallurgy, sometimes a flux is added,

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  13. In the proces of extraction of gold, Roasted ore + CN^(-) + H(2)O ov...

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  14. In the extraction of Al by Hall-Heroult's process, electrolyte contain...

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  15. Which is not true about electrolysis of "brine solution"?

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  17. In the electrorefining of impure aluminium, molten AICI3 is not used a...

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  18. Which of the following statement is false?

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  19. Lanthanoid metals can be separated by:

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  20. Which of the following is incorrectly matched:

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