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Arrange the four abundant elements in th...

Arrange the four abundant elements in the order of their decreasing abundance in the earth's crust.

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`O(46.6%)gtSi(27.7%) gt Al(8.3%)gtFe(4.7%)`
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CHHAYA PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-QUESTION - ANSWER ZONE FOR BOARD EXAMINATION (VERY SHORT ANSWER TYPE )
  1. Give an example of each of the following : (1) Liquid metal, (2) N...

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  2. Give example of two metals one of which is available in nature in the ...

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  3. Arrange the four abundant elements in the order of their decreasing ab...

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  4. Give an example of each of the following : (a) a light metal

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  5. Give an example of each of the following : (b) a heavy metal

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  6. Out of haematite (Fe(2)O(3)) and iron pyrites (FeS(2)), which one is t...

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  7. What type of ores are generally roasted ? Why ?

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  8. Cu and Ag exist as sulphides though they occupy lower positions in the...

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  9. Why do some metals occur in the native state?

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  10. What type of ores are concentrated by electromagnetic separation?

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  11. If the impurities are lighter than the ore, mention the process of the...

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  12. Explain why the concentraction of the sulphide ore is usually carried ...

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  13. Name the chief ores of Cu, Fe and Al. What are the methods employed fo...

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  14. Metal sulphides occur mainly in rocks and metal halides in lakes and s...

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  15. Write the name of a suitable flux to remove SiO(2) present as gangue.

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  16. How are the elements occupying higher positions of the electrochemical...

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  17. Out of C and CO, which is a better reducing agent for FeO in the lower...

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  18. CO cannot be used for the reduction of ZnO- why?

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  19. How cany the feasibility of reduction of a metal oxide by a metal be p...

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  20. Name an alloy of Cu that is used for making utensils.

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