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How would you account for the irregular of ionisation enthalpies (first) in the first series of the transition elements?

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Irregular variation of ionisation enthalpies is mainly attributed to varying degree of stability of different 3d-configurations (e.g., `d^(0),d^(5),d^(10)` are exceptionally stable).
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(i) Which of the first row transition metal exhibit +7 oxidation state? (ii) How would you account for the irregular variation of 1st and 2nd ionisation enthalpies in the 1st series of transition elements ? (iii) What are interstitial compounds ? (iv) Give two uses of potassium permanganate.

Assing a reason for each of the following observation : (i) The transition metals (with the exception of Zn, Cd and Hg) are hard and have high melting and boiling points (ii) The ionisation enthalpies (first and second) in the first series of the transition elements are found to vary irregularly

How would you account for the following? (i) The atomic radii of the metals of the third (5d) series of transition elements are virtually the same as those of the corresponding member of the second (4d) serie (ii) Because oxygen and fluorine are highly electronegative elements and small in size.

The first ionisation energies of the elements of the transition series.

Why is enthalpy of atomisation is the lowest for Zn in 3d series of transition elements ?

The CORRECT order of first ionisation enthalpy is :

NCERT-THE D AND F BLOCK ELEMENTS-Exercise
  1. How would you account for the irregular of ionisation enthalpies (firs...

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  2. Write down the electronic configuration of: (i). Cr^(3+) (ii). Pm^...

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  3. Why are Mn^(2+) compounds more stable than Fe^(2+) toward oxidation to...

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  4. Explain briefly how +2 state become more and more stable in the first ...

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  5. To what extent do the electronic configurations, decide the stability ...

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  6. What may be the stable oxidation state of the transition element with ...

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  7. Name the oxometal anions of the first series of the transition metals ...

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  8. What is lanthanoid contraction? What are the consequences of lanthanol...

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  9. What are the characteristics of the transition elements and why are th...

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  10. In what way is the electronic configuration of the transition elements...

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  11. What are the different oxidation states exhibited by the lanthanoids?

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  12. Explain gives reason. (a) Transition metal and many of their compoun...

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  13. What are interstitial compounds? Why are such compounds well known for...

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  14. How is the variability in oxidation states of transition metals differ...

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  15. Describe the preparation of potassium dichromate from iron chromite or...

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  16. Describe the oxidising action of potassium dichromate and write the io...

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  17. Describe the preparation of potassium permanganate. How does the acidi...

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  18. For M^(2+)//M and M^(3+)//M^(2+) systems the E^(ϴ) values for some met...

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  19. Predict which of the following will be coloured in aqueous solution? ...

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  20. Compare the stability of +2 oxidation state for the elements of the fi...

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  21. Compare the chemistry of actinoids with that of the lanthanoids with s...

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