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4. d and f- block elements — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistry4. d and f- block elements1 Mark
MCQ
Find incorrect comparison of second ionisation energy 
  • ✓
    $Te < Sb$
  • B
    $In > Sr$
  • C
    $He > B$
  • D
    $Fe < Fe^+$
✓

Answer

Correct option: A.
$Te < Sb$
a
Valence shell electron.

It is not easy to remove electron from half filled $P$ orbital.

Hence second ionisation energy of $T e$ is greater than $Sb$.

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