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Explain the following observation : La^(...

Explain the following observation : `La^(3+)` (Z =57) and `Lu^(3+)` (Z = 71) do not show any colour in solutions.

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MODERN PUBLICATION-d-AND f- BLOCK ELEMENTS-EXERCISE
  1. Express 1382 in roman numbers.

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  2. Complete the following chemical equation : Cr2O7^(2-) (aq)+ Fe^(2+) (a...

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  3. Explain the following observation : La^(3+) (Z =57) and Lu^(3+) (Z = 7...

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  4. Explain the following observation : Among the divalent cations in the ...

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  5. Explain the following observation : Cu^+ ion is not known in aqueous s...

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  6. Fill in the blanks- is the vitamin which is the component of rhodopsi...

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  7. Give reason for the following : E(M^(2+)|M)^(@)values are not regular ...

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  8. Give reason for the following : Although ‘F’ is more electronegative t...

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  9. Complete the following chemical equation : 2CrO4^(2-) + 2H^(+) rarr

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  10. Complete the following chemical equation : KMnO4 overset (513K) rarr

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  11. Why do transition elements show variable oxidation states ? Name the e...

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  12. Write the name of metal which shows only +3 oxidation state.

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  13. What is lanthanoid contraction ? Name an important alloy which contain...

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  14. Complete the following equation : Cr2O7^(2-)+2OH^(-) rarr

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  15. Complete the following equation : MnO4^(-)+ 4H^(+)+ 3e^(-) rarr

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  16. Account for the following : Zn is not considered as a transition elem...

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

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  18. Account for the following : The E^@ value for the Mn^(3+)|Mn^(2+) coup...

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  19. Give three differences between lanthanides and actinides.

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  20. Name a member of the lanthanoid series which is well known to exhibit ...

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