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Why Sc^(3+) salts are colourless whereas...

Why `Sc^(3+)` salts are colourless whereas `Cr^(3+)` salts are coloured.

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`Sc^(3+)` ions does not contain any unpaired electrons hence d-d transition does not take place.
`Cr^(3+)` ion contain 3 unpaired electrons, hence d-d transition takes place. Therefore `C^(3+)` ions are coloured.
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SUBHASH PUBLICATION-THE 'd' - AND 'f' - BLOCK ELEMENTS -Question and Answer
  1. Name a transition element which does not exhibit variable oxidation st...

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  2. Sc^(3+) ions are colourless where as V^(3+) ions are coloured. Give re...

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  3. Why Sc^(3+) salts are colourless whereas Cr^(3+) salts are coloured.

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  4. Why Ti^(4+) is colourless where as Cr^(3+) salts are coloured.

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  5. Name the electrode system which have positive E^(0) value in 3d series...

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  6. Give any two reasons for the formation of large number of complex comp...

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  7. Cu^(2+) ions are coloured but Zn^(2+) ions are colourless. Give reason...

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  8. Transition elements shows catalytic property. Give two reason.

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  9. What are interstitial compounds?

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  10. How is potassium dichromate prepared from chromite are ?

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  11. Show that chromates and dichromates are interconvertible.

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  12. Give the structure of chromate ion?

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  13. Give two example to show that potassium dichromate is an oxidising age...

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  14. How is potassium permanganate manufactured from MnO(2) (pyrolusite)?

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  15. Name a compound which is isostructural with KMnO(4).

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  16. What happens when potassium permanganate crystals are heated?

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  17. What is the shape of manganate and permanganate ions? Write structures...

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  18. What is the magnetic nature of manganate and permanganate ions.

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  19. Give four examples to show that acidified KMnO(4) is an oxidising agen...

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  20. What is lanthanoid contraction? Mention the cause for it.

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