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Indicate the steps in the preparation of...

Indicate the steps in the preparation of:
(i) `K_(2)Cr_(2)O_(7)` from chromite ore.`" "` (ii) `KMnO_(4)` from pyrolusite ore.

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NCERT TELUGU-THE D - ANd F - BLOCK ELEMENTS-Exercises
  1. Compare the stability of + 2 oxidation state of the elements of the fi...

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  2. Compare the chemistry of the actinoids with that of lanthanoids with r...

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  3. How would you account for the following: (i) Of the d^(4) species, ...

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  4. What is meant by 'disproportionation' ? Give an example of disproporti...

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  5. Which metal in the first series of transition metals exhibits + 1 oxid...

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  6. Calculate the number of unpaired electrons in the following gaseous io...

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  7. Give examples and suggest reasons for the following features of the t...

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  8. Indicate the steps in the preparation of: (i) K(2)Cr(2)O(7) from chr...

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  9. What are alloys? Name an important alloy which contains some of the la...

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  10. What are inner transition elements? Decide which of the following atom...

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  11. The chemistry of the actinoid elements is not so smooth as that of the...

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  12. Which is the last element in the series of the actinoids? Write the el...

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  13. Use Hund's rule to derive the electronic configuration of Ce^(3+) ion ...

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  14. Name a member of the lanthanoid senes which is well known to exhibit +...

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  15. Compare the chemistry of the actinoids with that of lanthanoids with r...

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  16. Write the electronic configurations of the elements with the atomic nu...

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  17. Compare the general characteristics of the first series of the transit...

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  18. Write down the number of 3d electrons in each of the following ions : ...

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  19. Comment on the statement that elements of the first transition series ...

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  20. What can be inferred from the magnetic moment values of the following ...

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