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What are chalcogens? Why are they so cal...

What are chalcogens? Why are they so called? 

A

ore producing

B

coal producing

C

chalk producing

D

charcoal producing

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VGS PUBLICATION-BRILLIANT-PRINCIPLES OF METALLURGY-EXERCISE
  1. The element or compounds of the metals which occur in nature in the ea...

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  2. Alumium is profitable to extract from

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

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  4. The metal never found in free state is

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

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  6. To extract the metal, the metallic oxide with

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

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  8. Thermite process involve the reaction of metal oxides with

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

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  10. The displacement reactions involving high reactive metals are highly

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

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  12. The method adopted to purify low melting metals by heating and making ...

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  13. is the method the required metal gets deposited at the cathode.

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  14. Tarnishing of silver is due to formatio of

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  15. Development of green coating on copper is due to

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  16. The electrolyte used in refinery of copper is

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  17. Auto reduction possible withores.

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  18. is used to carry out pyrochemical process.

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  19. The place where the ore is kept in the furnace for heating purpose is

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  20. furnace has both furnace and hearth separated.

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