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How would you account for the following:...

How would you account for the following: Cobalt(II) is stable in aqueous solution but in the presence of complexing reagents it is easily oxidised.

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MODERN PUBLICATION-d-AND f- BLOCK ELEMENTS-EXERCISE
  1. How would you account for the irregular variation of ionisation enthal...

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  2. Write chemical reaction for preparation of K2Cr207 from chromite ore.

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  3. What is meant by ‘disproportionation’? Give two examples of disproport...

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  4. Compare the chemistry of actinides with that of Lanthanides with speci...

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  5. Compare the chemistry of actinides with that of Lanthanides with speci...

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  6. The 4d and 5d series of transition metals have more frequent metal-met...

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  7. What are the main consequences of lanthanoid contraction ?

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  8. Complete the following reaction equation : MnO4^(-) + Fe^(2+) + H^(+) ...

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  9. Complete the following reaction equation : MnO4^(-) + I^(-) + H2O rarr

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  10. Complete the following reaction equation : S2O3^(2-)+ Cr2O7^(2-)+ H^(...

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  11. How would you account for the following : The transition elements exhi...

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  12. How would you account for the following : Of the d^4 species, Cr^(2+) ...

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  13. How would you account for the following: Cobalt(II) is stable in aqueo...

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  14. Why is equropium (II) more stable than cerium (II) (Eu = 63, Ce =58) g...

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  15. Why Zr and Hf exhibit similar properties ?

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  16. Explain the following : Scandium forms no coloured ions, yet it is reg...

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  17. Explain the structure of chromate and dichromate ions.

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  18. Why do transition metals and their compounds are found to be good cata...

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  19. The paramagnetic character of first transition series increases upto m...

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  20. Why do transition metals form complexes and coloured ions?

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