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MHT CET202526 Apr 2025Evening ShiftChemistryd and f Block ElementsActual

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

Options

  1. A2.84
  2. B3.87
  3. C1.73
  4. D0.0

Correct answer

C. 1.73

Step-by-step solution

The spin-only magnetic moment of Cu ²⁺ ( Z = 29 ) is determined from its 3d^9 configuration, where nine electrons occupy the d-orbitals with one unpaired electron remaining. Applying the spin-only magnetic moment formula _s = n(n+2) BM with n = 1 yields _s = 3 1.73 BM. This corresponds to option C.

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