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The gas released in calcination is...

The gas released in calcination is

A

`O_2`

B

`NO_2`

C

`SO_2`

D

`CO_2`

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VGS PUBLICATION-BRILLIANT-PRINCIPLES OF METALLURGY-EXERCISE
  1. Most abundant ore of iron is

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  2. If the gangue is basic, the flux used is

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  3. The gas released in calcination is

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  4. The method suitable for concentration of the sulphide ores is

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  5. Arranging metals in the decreasing order of their reactivity is called

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  6. The method suitable for purification of low boiling metals is

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  7. The corrosion of iron object is favoured by

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  8. A process in which the ore is strongly heated in the absence of air or...

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  9. The process of extraction of metals from their ore is called.

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  10. The element or compounds of the metals which occur in nature in the ea...

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  11. Alumium is profitable to extract from

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  12. What are chalcogens? Why are they so called?

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  13. The metal never found in free state is

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  14. The element that does not displace hydrogen from dilute acids is

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  15. To extract the metal, the metallic oxide with

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  16. High reactivity metals are extracted by of their fused compounds.

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  17. Thermite process involve the reaction of metal oxides with

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  18. Suitable impurities are added to the ore to decrease its

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  19. The displacement reactions involving high reactive metals are highly

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  20. The process of obtaining the pure metal from the impure metal is calle...

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