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Classification of Elements and Periodicity in Properties — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryClassification of Elements and Periodicity in Properties1 Mark
MCQ
The incorrect statement among the following is :
  • A
    The first ionisation potential of $\ce{Al}$ is less than the first ionisation potential of $\ce{Mg}$.
  • ✓
    The second ionisation potential of $\ce{Mg}$ is greater than the second ionisation potential of $\ce{N}.$
  • C
    The first ionisation potential of $\ce{Na}$ is less than the first ionisation potential of $\ce{Mg}.$
  • D
    The third ionisation of potential of $\ce{Mg}$ is greatest.
✓

Answer

Correct option: B.
The second ionisation potential of $\ce{Mg}$ is greater than the second ionisation potential of $\ce{N}.$
After removal of an electron sodium acquires stable noble gas configuration. It is difficult to remove electron from stable noble gas configuration species.
Therefore, second ionization potential of $\ce{Mg}$ is less than that of $\ce{Na}$.

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