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Complete the following reaction . Al...

Complete the following reaction .
`Al_2O_3 underset(900-950^(@)C)overset(Delta)to "_______" +O_2`

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`Al_2O_3 underset(900-950^(@)C)overset(Delta)to 4Al+O_2`
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SURA PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS -ADDITIONAL QUESTIONS & ANSWERS ( VERY SHORT ANSWERS )
  1. Give the principle behind hydraulic washing .

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  2. What is meant by ductility ?

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  3. Complete the following reaction . Al2O3 underset(900-950^(@)C)over...

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  4. In Hall's process of electrolytic reduction of alumina . Name the Cath...

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  5. In Hall's process of electrolytic reduction of alumina . Name the Anod...

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  6. In Hall's process of electrolytic reduction of alumina . Name the elec...

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  7. What happen with aluminium is heated to 800^(@)C ?

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  8. What happens when aluminium is treated with dilute sulphuric acid ?

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  9. Give any three uses of aluminium.

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  10. Name the important ores of Copper .

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  11. What is the cathode , anode and electrolyte used in the electrolytic r...

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  12. What is anode mud ?

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  13. Copper vessels gets covered with a green layer . Explain .

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  14. Explain the action of dil. HNO3 with copper .

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  15. Write the ores of Iron with its chemical formula.

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  16. Name the process . Ore heated in the absence of air .

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  17. Name the process . Ore heated in the presence of excess of air .

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  18. Explain the action of heat on Iron .

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  19. Write the uses of Pig iron .

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  20. Iron when dipped in conc. HNO3 becomes chemically inert . Give reason...

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