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MHT CET202523 Apr 2025Evening ShiftChemistryd and f Block ElementsActual

What is the value of spin only magnetic moment for Mn ²⁺ in BM ?

Options

  1. A3.87
  2. B4.9
  3. C1.73
  4. D5.92

Correct answer

D. 5.92

Step-by-step solution

The atomic number of manganese is 25, and removing two electrons from [ Ar ] 3d^5 4s^2 yields the Mn ²⁺ configuration [ Ar ] 3d^5 . 3d^5 has five unpaired electrons due to Hund's rule, giving a spin-only magnetic moment _s = n(n+2) = 5 7 = 35 BM. Since 35 5.92 BM, the correct choice is D .

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