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The common method for the extraction of ...

The common method for the extraction of metals from oxide ores involves _________.

A

Reduction with carbon

B

Reduction with aluminium

C

Reduction with hydrogen

D

Electrolytic method

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The correct Answer is:
A
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(1) Metals occur in the native form because of their (a) High electronegativity (b) Low reactivity ( c) Low density (d) High reactivity (2) Specific gravity of slag is (a) Higher than molten metal (b) Same as that of molten metal ( c) Less as that of molten metal (d) None of the above (3) Which process is used for the extraction of metals from their sulphide ores ? (a) Smelting Froth flotation ( c) Electrolysis (d) Metal displacement (4) Calamine is an ore of (a) Hg (b) Zn ( c) Ca (d) Cd (5) Non-fusible impurities of ores removed by adding Slag (b) Flux ( c) Gangue (d) None (6) Common method of extraction of metals from oxide ore involves. (a) Reduction with aluminium (b) Reduction with carbon Reduction with hydrogen (d) Electrolytic method (7) Smelting is the reduction of oxide to metal by (a) Carbon (b) Hydrogen ( c) Aluminimum (d) Electric current During froth flotation process, commonly used frother is. (a) CuSO_(4) (b) NaCN + alkali ( c) Pine oil (d) Potassium xanthate (9) Iron ores are dressed by (a) Froth flotation process (b) Hand picking ( c) Magnetic separation (d) All of the above (10) Silicon is the main constituent of (a) Alloys (b) Rocks ( c) Animals Plants.

MOTION-METALLURGY-EXERCISE 1
  1. The aim of addition of flux along with the ore during smelting is

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  2. Which one of the following metals is extracted by carbon reduction pro...

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  3. The common method for the extraction of metals from oxide ores involve...

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  4. Specific gravity of slag is

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  5. Heating of carbonates to remove carbon is called as –

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  6. Which one of the following is not a basic flux –

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  7. False statement is –

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  8. Which one of the following reactions is an example for calcination pro...

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  9. Match List-I (Metal) with List-II (Process of Extraction) and select t...

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  10. When a sulphide ore is roasted, the product obtained is usually –

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

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

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  13. The purest variety of iron is called

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

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

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

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  17. A reaction showing slag formation is .

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

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

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  20. Tin and lead can be refined by

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