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Calcination is a pyrochemical process in...

Calcination is a pyrochemical process in which the ore is heated in the

A

presence of air

B

absence of air

C

presence of flux

D

absence of flux

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VGS PUBLICATION-BRILLIANT-PRINCIPLES OF METALLURGY-EXERCISE
  1. Metals occur in the native form because of their

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  2. Correct statement among the following is

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  3. Calcination is a pyrochemical process in which the ore is heated in th...

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  4. Roasting is carried out in

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  5. Most abundant element in the earth's crust by weight is

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  6. The substance added to remove the impurity is

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  7. Which of the following slag is formed between CaO and SiO2?

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  8. Which of the pairs of ores are carbonate ores ?

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  9. Method of extraction of metal from purified ore depends on

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  10. More active metals are not obtained from their ores by simple reductio...

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  11. ‘Na' metal is prepared from fused NaCl by

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  12. Which combination is wrong for the extraction of sodium metal from fus...

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  13. Which of the following step is not involved in the extraction of Ag ?

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  14. Which of the following impurities are present in a metal after reducti...

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  15. The selection of process of purification of a metal depends on:

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  16. Liquation is used for purification of metal if:

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  17. Chemically rust is a

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  18. When an Iron object is painted, the process of corrosion is reduced du...

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  19. The furnaces in which there is no direct contact between the hearth an...

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  20. Active metals are not extracted by the electrolysis or aqueous electro...

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