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Why the third ionization energy of manga...

Why the third ionization energy of manganese (atomic number 25) unexpectedly high?

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Due to highly stable configuration of `Mn^(2+)(3d^5)`, energy required to remove third electron from `Mn^(2+)` is very high.
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ICSE-d- AND- f- BLOCK ELEMENTS-EXERCISE (PART-II) (DESCRIPTIVE QUESTIONS)(VERY SHORT ANSWER QUESTIONS)
  1. Which is more basic La(OH)(3)zor Lu(OH)3 ? Why?

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  2. What is the basic difference between the electronic configurations of ...

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  3. Why do transition elements show similarities along the horizontal peri...

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  4. Why the third ionization energy of manganese (atomic number 25) unexpe...

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  5. Which property of the transition elements makes them good catalysts?

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  6. What are coinage metals ?

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  7. Write the ionic reaction for the reaction between MnO4^(-) ions and ox...

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  8. Write one reaction using alkaline KmnO4.

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  9. Write the electronic configuration of the element with atomic number 1...

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  10. What is the electronic cofiguration of charomium atom (z= 24) Give re...

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  11. Why are Cd^(2+) salts white ?

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  12. Though a transition element, scandium (Z = 21) does not exhibit variab...

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  13. Account for the following: There are irregularities in the electron...

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  14. The gradual decrease in size (actionoid contraction) is from element t...

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  15. (a) Complete the following chemical equations : (i) MnO(4)^(-) (aq) ...

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  16. Assign reasons for the following : (i) Copper (I) ion is not known i...

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  17. Why is Cr^(2+) reducing and Mn^(3+) oxidising when both have d^(4) con...

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  18. How would you accont for the following? Lanthanoids form primarily +...

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  19. How would you account for the following : (i) Among lanthanoids , Ln...

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  20. Explain the following observations : (i) Many of the transition elem...

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