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3. Classification of elements and periodicity in properties — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry3. Classification of elements and periodicity in properties1 Mark
MCQ
The first ionization enthalpies of $Be , B , N$ and $O$ follow the order$....$
  • A
    $O < N < B < Be$
  • B
    $Be < B < N < O$
  • C
    $B < Be < N < O$
  • ✓
    $B < Be < O < N$
✓

Answer

Correct option: D.
$B < Be < O < N$
d
$1^{st}\,\,I.E.$ $\underset{\left(2 p ^{3}\right)}{ N }>\underset{\left(2 p ^{4}\right)}{ O }>\underset{\left(2 s^{2}\right)}{ Be }>\underset{\left(2 p ^{1}\right)}{ B }$

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