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Redox Reactions — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryRedox Reactions1 Mark
MCQ
The largest oxidation number exhibited by an element depends on its outer electronic configuration. With which of the following outer electronic configurations the element will exhibit largest oxidation number?
  • A
    $3 d^1 4 s^2 $
  • B
    $ 3 d ^34 s ^2 $
  • C
    $ 3 d^5 4 s^1 $
  • ✓
    $ 3 d^5 4 s^2$
✓

Answer

Correct option: D.
$ 3 d^5 4 s^2$
Highest $O.N$. of any transition element $= (n – 1)d$ electrons $+ns$ electrons. Therefore, larger the number of electrons in the $3d$ orbitals, higher is the maximum $O.N$.
  1. $ 3 d^1 4 s^2=3 $
  2. $ 3 d^2 4 s^2=3+2=5 $
  3. $ 3 d^5 4 s^1=5+1=6 $
  4. $ 3 d^5 4 s^2=5+2=7$

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