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Sc^(3+) ion is colourless while Cr^(3+) ...

`Sc^(3+)` ion is colourless while `Cr^(3+)` Ion is coloured.
Explain.

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JMD PUBLICATION-d-And f-BLOCK ELEMENTS-Example
  1. Explain why Cu(I) is diamagnetic while Cu(II) is paramagnetic.

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  2. Why are halogens coloured ?

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  3. Sc^(3+) ion is colourless while Cr^(3+) Ion is coloured. Explain.

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  4. Transition metals form alloys with other transition metals. Explain.

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  5. Transition elements and their compounds are found to be good catalysts...

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  6. Transition metals formlarge number of complex compounds.Explain.

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  7. Why is the highest oxidation state of a metal exhibited in its oxide...

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  8. Which is stronger reducing agent Cr^(2+) or Fe^(2+) and why ?

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  9. Why are Min^(2+) compounds more stable than Fe^(2+) towards oxidation ...

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  10. What is meant by ‘disproportionation' of an oxidation state ? Give a...

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  11. Why Zn, Cd, Hg are soft and have low m.pt.

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  12. The d^1 configuration is very unstable in transition metal ions. Exp...

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  13. Which does not belong to first transition series?

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  14. In Alkaline solution we have chromates and in acidic solution, dichrom...

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  15. Write a short note on chromyl chloride test.

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  16. Explain the structure of chromate and dichromate ions.

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  17. Write reactions of K2Cr2O7, in acidic medium with Kl

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  18. How acidified K2Cr2O7 reacts with the following : FeSO4

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  19. Write reactions of K2Cr2O7, in acidic medium with H2S.

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  20. How acidified K2Cr2O7 reacts with the following : Na2SO4

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