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

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 3. Classification of elements and periodicity in properties4 Marks
MCQ
Which of the following statements is incorrect?
  • A
    The second ionization energy of sulphur is greater than that of chlorine
  • ✓
    The third ionization energy of phosphorus is greater than that of aluminium
  • C
    The first ionization energy of aluminium is approximately the same as that of gallium
  • D
    The second ionization energy of boron is greater than that of carbon
✓

Answer

Correct option: B.
The third ionization energy of phosphorus is greater than that of aluminium
b
The second ionization energy of sulphur is greater than that of chlorine because after removing of $1^{st}$ electron it gets extra stability due to half-filled configuration.

But as after removal of the third electron, $P$ gets extra stability due to full filled $s$ orbitals so third ionization energy of phosphorus is lower than that of aluminium.

The first ionization energy of aluminium is approximately the same as that of gallium due to similar charge density.

The second ionization energy of boron is greater than that of carbon because in case of $B$ and electron has to be removed from filled $2 s$ orbitals.

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