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Beryllium has higher ionisation enthalpy...

Beryllium has higher ionisation enthalpy than boron.This can be explained as,

A

Beryllium has higher size than boron hence its ionisation enthalpy is higher

B

Penetration of 2p-electrons to the nucleus is more than the 2s-electrons

C

It is easier to remove electron from 2p-orbital as compared to 2s-orbital due to more penetration of s-electrons

D

Ionisation energy increases in a period.

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The correct Answer is:
C
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NCERT FINGERTIPS-CLASSIFICATION OF ELEMENTS AND PERIODICITY -Periodic Trends In Properties Of Elements
  1. Which of the following can most easily form unipositive gaseous ion?

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  2. Amongst the metal Be, Mg, Ca and Sr of group 2 of the periodic table, ...

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  3. Beryllium has higher ionisation enthalpy than boron.This can be explai...

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  4. A sudden large jump between the values of second and third ionisation ...

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  5. Few elements are matched with their successive ionisation energies,Ide...

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  6. First and second ionisation enthalpies(in KJ/mol) of few elements are ...

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  7. Ionization enthalpies of transition metals are

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  8. Consider these electronic configurations for neutral atoms: (i) 1s^(...

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  9. Which of the following element will have highest ionization energy?

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  10. Few values of enthalpies are given below: O=-141 KJ mol^(-1) F= -328 K...

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  11. In the given graph,a periodic property (R) is plotted against atomic n...

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  12. Which is correct increasing order of their tendency of the given eleme...

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  13. Which of the following have least electron affinity?

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  14. Which one of the following arrangements represents the correct order o...

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  15. Which of the following statements is not correct about the electron ga...

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  16. Why is the electron gain enthalpy of O or F less than that of S or Cl?

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  17. Which of the following statements regarding an anion is not true?

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  18. Which of the following properties of isotopes of an element is differe...

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  19. Given below are the names of new elements based on their position in t...

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  20. Which of the following noble gases has the maximum positive electron g...

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