Verified Solution • 2025–26 Session moderate

QJEEM21Ch2cb0: JEE Main 2021 Chemistry - Class 12 JEEM21Ch2cb0 Solution: Identify the element for which electronic configuration in +3…

Identify the element for which electronic configuration in +3 oxidation state is [Ar]3d5 :

Multiple Choice Options

  • A Ru
  • B Mn
  • C Co
  • D Fe

Step-by-Step Verified Solution

Mn(25) = [Ar]3d54s2

Mn+3 = [Ar]3d44s0

Ru-belongs to 4d transition series

Co (27) = [Ar]3d74s2

Co+3 = [Ar]3d64s0

Fe(26) = [Ar]3d64s2

Fe+3 = [Ar]3d54s0

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