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Why Sm^(2+), Eu^(2+) and Yb^(2+) ions in...

Why `Sm^(2+)`, `Eu^(2+)` and `Yb^(2+)` ions in solutions are good reducing agents but an aqueous solution of `Ce^(4+)` is a good oxidising agent?

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ASSAM ACADEMIC CENTRE-The d and f-block elements-Example
  1. Explain why E^@ for Mn^(3+)||Mn^(2+) couple is more positive than that...

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  2. Among the ionic species, Sc^(3+), Ce^(4+) and Eu^(2+), which one is a ...

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  3. Why Sm^(2+), Eu^(2+) and Yb^(2+) ions in solutions are good reducing a...

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  4. In the transition series with an increase in atomic number the atomic ...

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  5. Among the lanthanoids, Ce(III) can be easily oxidised to Ce(IV) (Atomi...

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  6. Why is third ionisation enthalpy of manganese exceptionally high?

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  7. Why are all salts of scandium white?

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  8. Why is +2 oxidation state of manganese quite stable while the same is ...

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  9. Name a transition element which does not exhibit variable oxidation st...

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  10. How would you account for the following? The enthalpies of atomization...

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  11. What are transition elements? Give the general electronic configuratio...

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  12. Why is copper considered a transition metal, although it has completel...

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  13. Assign a reason for each of the following: The third ionization enthal...

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  14. Assign a reason for each of the following: The third ionization enthal...

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  15. Though copper, silver and gold have completely filled set of d-orbital...

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  16. Give the electronic configuration of copper (Z = 29).

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  17. What is the action of acidified K2Cr2O7 on KI?

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  18. What are amalgams?

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  19. Which is the densest transition metal?

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  20. What are coinage elements?

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