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Cu and Ag exist as sulphides though they...

Cu and Ag exist as sulphides though they occupy lower positions in the electrochemical series - why?

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Copper and silver ions having high polarising power can easily polarise the large sulphide ions to form metal sulphides which are relatively more stable than the corresponding metals. For this reason, these elements eist in nature as sulphides.
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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. Out of haematite (Fe(2)O(3)) and iron pyrites (FeS(2)), which one is t...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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  16. Name the gas used for the separation of Ni from impurities by Mond pro...

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  17. Explain why invar is used for making meter scale.

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  18. What is copper matte?

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  19. Name the anode used in electrolytic refining of Cu?

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  20. How can a small amount of Cd be removed from zinc?

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