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Explain the deviation in ionsation entha...

Explain the deviation in ionsation enthalpy of some elements from the general trend by using given figure.

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There is deviation of ionisation enthalpy of some elements from the general trend as shown in figure. The first ionisation enthalpy of B is lower than that of Be and in case of nitrogen, the first ionisation enthalpy is higher than that of O.
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NCERT EXEMPLAR ENGLISH-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES.-Short answer types questions
  1. The negative value of electron gain enthalpy is less for fluorine than...

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  2. All transition elements are d-block elements, but all d-block elements...

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  3. Identify the group and valency of the elements having atomic number 11...

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  4. Ionisation enthalpies of elements of second period are given below Ion...

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  5. Among the elements, B, Al, C and Si, a) which element has the highes...

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  6. Writer four characteristic properties of p-block elements.

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  7. Choose the correct order of atomic radii of fluorine and neon (in pm) ...

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  8. Illustrate by taking examples of transition elements and non-transitio...

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  9. Nitrogen has positive electron gain enthalpy whereas oxygen has negati...

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  10. First member of each group of representative elements (i.e., s and p-b...

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  11. p-block elements form acidic, basic and amphoteric oxides. Explain eac...

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  12. How would you explain the fact that the first ionisation enthalpy of s...

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  13. What do you undestand by exothermic reaction and endothermic reaction?...

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  14. Arrange the elements N, P, O and S in the order of i) increasing fir...

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  15. Explain the deviation in ionsation enthalpy of some elements from the ...

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  16. Explain the following a) Electronegatively of elements increase on m...

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  17. How does the metallic and non-metalic character vary on moving from le...

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  18. The radius of Na^(+) cation is less than that of Na atom. Give reason.

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  19. Among alkali metals which element do you expect to be least electroneg...

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