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What is the significance of leaching in the extraction of aluminium?

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CBSE COMPLEMENTARY MATERIAL-SOLVED SAMPLE PAPER (CBSE DELHI - 2017)-CBSE DELHI - 2017
  1. Write the principle of method used for the refining of germanium.

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  2. Out of PbS and PbCO(3) (ores of lead), which one is concentraed by fro...

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  3. What is the significance of leaching in the extraction of aluminium?

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  4. Write structures of compounds A, B and C in each of the following reac...

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  5. Write structures of compounds A, B and C in each of the following reac...

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  6. Do the following conversions in not more than two steps Benzoic acid...

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  7. Do the following conversions in not more than two steps Ethyl benzen...

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  8. Do the following conversions in not more than two steps Prepanone to...

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  9. Write the structures of the monomers used for getting the following po...

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  10. Write the structures of the monomers used for getting the following po...

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  11. Write the structures of the monomers used for getting the following po...

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  12. Define the following : Anionic detergents

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  13. Define the following : Broad spectrum antibiotics

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  14. Define the following : Antiseptic

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  15. Give reasons : Thermal stability decreases from H(2)O " to " H(2) Te...

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  16. Give reasons : Fluoride ion has higher hydration enthalpy than chlor...

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  17. Give reasons : Nitrogen does not form pentahalide.

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  18. Give reasons : Acetylation of aniline reduces its activation effect.

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  19. Give reasons : CH(3)NH(2) is more basic than C(6)H(5)NH(2).

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  20. Give reasons : Although -NH(2) is o/p directing group, yet aniline o...

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