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Write the increasing order of ionisation...

Write the increasing order of ionisation enthalpies of Be, B, C, N and O. Why the trend does not correspond to the atomic numbers? 

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AAKASH SERIES-PERIODIC TABLE-QUESTIONS FOR DESCRIPTIVE ANSWERS
  1. What is the role played by the  inner electrons on the radius and ioni...

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  2. Write the differences between ionisation enthalpy and electron gain en...

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  3. Write the increasing order of ionisation enthalpies of Be, B, C, N and...

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  4. Which among the following should have a smaller second ionisation ener...

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  5. How are bond energies useful for the calculation of electronegativity?

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  6. Both ionisation enthalpy and electron gain enthalpy have some irregula...

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  7. With reference to the periodic table, name the following : (a) the h...

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  8. Mention different chemical criteria to call an element as metal.

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  9. How do you account for the highly electro-positive nature of alkali me...

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  10. What are anhydrides? Write exmples of acidic and basic anhydrides.

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  11. Alkali metals are good reductants and halogens are good oxidants. Why?

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  12. Comment on the following : (a) vertical relationship of elements, (b...

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  13. How many periods are needed to accommodate all elements up to Z value ...

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  14. How is polarisation power useful in explaining the diagonal relationsh...

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  15. I1 and I2 of an element are 700 and 1200 kJmol""^- If 1000 kJ "mol"^(-...

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  16. The energy required for the following process is 1.96 xx 104" kJ mol"^...

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  17. Compare the ionisation potentials of He and He^(+). Account for the di...

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  18. Bond energies of H2, F2 and HF are respec tively 104.2, 36.6 and 134.6...

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  19. Ionisation enthalpy of chlorine is "13 eV atom"^(-1) Electron gain ent...

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  20. Be forms Be^(2+) and Al^(3+) forms Al^(3+). If the radii of Be^(2+) an...

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