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Which of the following is an amphoteric ...

Which of the following is an amphoteric oxide ? 

A

`Al_2O_3`

B

CaO

C

MgO

D

`Na_2O`

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BEYOND PUBLICATION-PRINCIPLES OF METALLURGY-EXERCISE
  1. The process of coating Zn over Fe is known is

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  2. Identify an ore containing sulphur in it.

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  3. Which of the following is an amphoteric oxide ?

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  4. Which is not a sulphide ore of metal ?

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  5. Which of the following alloys does not contain copper

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  6. Which of the following is the least abundant metal in earth's crust ?

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  7. A mineral is called ore if…….

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  8. Concentration by forth floatation is applicable for which of the follo...

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  9. Specific gravity of slag is always :

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  10. Polling process is employed for the removal of

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  11. Highly electropositive metals can not he extracted by carbon reduction...

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  12. Tamishing of silver is due to the presence of this gas in air……..

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  13. Pyrochemical processes in metallurgy are carried out in structure call...

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  14. The following metal is obtained by the auto reduction of its sulphide ...

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  15. Name the common elements present in the anode mud in the eletrolytic r...

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  16. Rusting of iron takes place in

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  17. The principle behind froth floatation is :

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  18. In Goldschmit alumino thermic process, thermite mixture is :

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  19. In the metallurgical extraction of iron, which of the following proces...

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  20. During the electrolysis of molten salts, the metals are always produce...

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