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

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry3. Classification of elements and periodicity in properties1 Mark
MCQ
Identify the element for which electronic configuration in $+3$ oxidation state is $[\mathrm{Ar}] 3 \mathrm{~d}^{5}$ :
  • A
    $\mathrm{Ru}$
  • B
    $Mn$
  • C
    $Co$
  • ✓
    $\mathrm{Fe}$
✓

Answer

Correct option: D.
$\mathrm{Fe}$
d
$\mathrm{Fe}^{3+}[\mathrm{Ar}] 3 \mathrm{~d}^{5}$

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