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Why are halogens coloured ?...

Why are halogens coloured ?

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Why halogens are coloured gases and they are very reactive ? Comment on it.

Why are halogens most reactive ?

Why are halogens strong oxidising agents?

Why transition metals are generally coloured ?

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Explain the following fact : Halogens are coloured.

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JMD PUBLICATION-d-And f-BLOCK ELEMENTS-Example
  1. Explain :Transition elements exhibit variable oxidation states.

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  2. Explain why Cu(I) is diamagnetic while Cu(II) is paramagnetic.

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  3. Why are halogens coloured ?

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

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

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

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

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

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

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

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

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

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

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  14. Which does not belong to first transition series?

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

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  16. Write a short note on chromyl chloride test.

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  17. Explain the structure of chromate and dichromate ions.

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

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  19. How acidified K2Cr2O7 reacts with the following : FeSO4

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

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