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Which of the following activities is not...

Which of the following activities is not related to poling ?

A

Metallic impurities having higher oxidation potential than the metal to be refined are oxidized first.

B

Non-volatile oxides are removed in the form of scum.

C

Metallic impurities having lower oxidation potential than the metal to be refined settle down at the bottom of the furnace.

D

Green poles of wood are used as stirrers.

Text Solution

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The correct Answer is:
C
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MOTION-METALLURGY-EXERCISE 1
  1. When a sulphide ore is roasted, the product obtained is usually –

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  2. Which of the following curves assures that the metal obtained by carbo...

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  3. Which of the following activities is not related to poling ?

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  4. The purest variety of iron is called

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  5. The Elingham diagram (Fig.) represents the formation of oxides of seve...

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  6. The Elingham diagram (Fig.) represents the formation of oxides of seve...

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  7. The slag obtained during the extraction of copper from coper pyrites i...

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  8. A reaction showing slag formation is .

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  9. In the metallurgy of iron, when limestone is added to the blast furnac...

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  10. A flux is often added to remove impurities from a concentrated ore. ...

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  11. Tin and lead can be refined by

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  12. Refining of silver is done by :

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  13. CO on passing over heated nickel gives

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  14. (xiii) Which process represents the change, Ti + 2I(2) rarr TiI(4) r...

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  15. Purification of Silicon element used in semiconductors is done by .

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  16. Mond's process is used for

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  17. In the Hoope’s process for refining of aluminium, the fused materials ...

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  18. The oxidation numbers of Fe and S in iron pyrites are

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  19. Extraction of zinc from zinc blende is achieved by:

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  20. Oxidation states of the metal in the minerals haematite and magnetite,...

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