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The reaction Cr(2)O(3)+ 2Al to Al(2)O(3)...

The reaction `Cr_(2)O_(3)+ 2Al to Al_(2)O_(3)+ 2Cr (DeltaG^(@)=-421 KJ)` is thermodynamically feasible due to -ve value of `DeltaG`. Why does this reaction not take place at room temperature ?

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Some amount of activation energy is required even for reactions which are thermodynamically feasible. Hence heating is required.
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CENGAGE CHEMISTRY ENGLISH-APPENDIX INORGANIC VOLUME 2-Short Answer Type
  1. The reaction Cr(2)O(3)+ 2Al to Al(2)O(3)+ 2Cr (DeltaG^(@)=-421 KJ) is ...

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  2. Which metals are generally extracted by the electrolytic processes ? W...

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  3. What type of ores are roasted?

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  4. Give the names of the four most abundant elements in the earth's crust...

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  5. What is a mineral? How does it differ from an ore?

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

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  7. Name the method used for refining of : (a). Zirconium. (b). Nickel...

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  8. Can iron be purified by amalgamation?

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  9. Both iron and aluminium combine slowly with oxygen at room temperature...

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  10. What is the name given to solid phase of earth?

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  11. Give one example where hydrometallurgy is used for metal extraction?

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  12. Name the method of metal refining which is generally used when a metal...

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  13. When is electrolytic reduction applied for getting a metal?

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  14. What name is given to carbon reduction process for extracting the meta...

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  15. An ore has impurities which are attracted by magnet suggest process fo...

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  16. In moist air, copper corrodes to produce a green layer on the surface....

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  17. The value ofDelta (f) G^(Ө) for formation of Cr(2) O(3) is – 540 kJmo...

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  18. What do you understand by roasting in presence of NaCl?

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  19. Why NF3 cannot be hydrolysed, while NCl3 can be readily hydrolysed?

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  20. Why NI5 does not exist While PCl5 exists?

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  21. Why the boiling point of ammonia is greater than phosphine?

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