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JEE Main202131 Aug 2021Evening ShiftChemistryCoordination CompoundsActual

Spin only magnetic moment in BM of Fe CO 4 C 2 O 4 + is :

Options

  1. A5 . 92
  2. B1
  3. C0
  4. D1 . 73

Correct answer

D. 1 . 73

Step-by-step solution

In Fe ( CO ) 4 C 2 O 4 + Oxidation no. of Fe = + 3 26 Fe + 3 = Ar 18 3   d 5 4   s 0 CO is a Strong field ligand, so paring occurs against the Hund's rule. Fe + 3 = t 2 g 2 , 2 , 1   eg 0 , 0 Number of unpaired electron = 1 so magnetic moment μ = n n + 2 B.M. = 1 1 + 2 = 3 = 1 . 73   BM

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