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Why is the third ionization enthalpy of ...

Why is the third ionization enthalpy of manganese (At. no.=25) unexpectedly high ?

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MODERN PUBLICATION-d-AND f- BLOCK ELEMENTS-EXERCISE
  1. Complete the following chemical equation : Cu^(2+) (aq) + I^(-) (aq) ...

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  2. How would you account for the following ? The oxidising power of oxoan...

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  3. Why is the third ionization enthalpy of manganese (At. no.=25) unexpec...

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  4. How would you account for the following ? Cr^(2+) is stronger reducing...

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  5. Express 1382 in roman numbers.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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