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BITSAT2019Chemistryd and f Block ElementsActual

Spin only magnetic moment of Mn 4 + ion is nearly

Options

  1. A3   BM
  2. B6   BM
  3. C4   BM
  4. D5   BM

Correct answer

C. 4   BM

Step-by-step solution

Electronic configuration of Mn is Z = 25 = Ar 3 d 5 4 s 2 ∴ Electronic configuration of Mn 4 + is = Ar 3 d 3 Thus, Mn 4 + has 3 -unpaired electron and its spin only magnetic moment μ is, μ = n n + 2 BM where, n = number of unpaired electrons. μ = 3 ( 3 + 2 ) .   BM ⇒ μ = 15 = 3 . 87 BM ≈ 4 BM

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