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Heating of ore in presence of air to rem...

Heating of ore in presence of air to remove sulphure impurities is called

A

Calcination

B

Roasting

C

Smelting

D

None of these

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The correct Answer is:
B
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AAKASH INSTITUTE ENGLISH-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-Assignment (Section-C) Previous Years Question
  1. Which of the following does not contain aluminium?

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  2. Which of the following does not contain Mg?

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  3. Carborundum is

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  4. In the basic Bessemer process for the manufacture of steel, the lining...

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  5. Mond's process is used for

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  6. Which process of purification is represented by the following reaction...

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  7. Which of the following sulphides when heated strongly in air gives the...

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  8. The most important ore of tin is

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  9. Heating of ore in presence of air to remove sulphure impurities is cal...

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  10. The process used for the extraction of sodium is called :

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  11. Among the metals Cr,Fe,Mn,Ti,Ba, and Mg, the one that cannot be obtain...

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  12. Chemical used as a depressant in separatin ZnS from PbS in froth-float...

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  13. The ore that contains both iron and copper is: a. malachite b. dolomit...

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  14. To dissolve argentite ore which of the following is

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  15. The iron obtained from the blast furnace is called:

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  16. How are metals used as semiconductors refined ? What is the principle ...

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  17. Which of the following oxide is least stable?

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  18. The underlying of blast furnace is made of

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  19. Roasting of sulphides gives the gas X as a by-product. This is a colou...

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  20. Which of the following mineral contains calcium as well as magnesium ?

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