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JEE Main20258 Apr 2025Evening ShiftChemistryd and f Block ElementsActual

The correct decreasing order of spin only magnetic moment values ( BM ) of Cu ⁺, Cu ²⁺, Cr ²⁺ and Cr ³⁺ ions is :

Options

  1. ACu ⁺ Cu ²⁺ Cr ³⁺ Cr ²⁺
  2. BCu ²⁺ Cu ⁺ Cr ²⁺ Cr ³⁺
  3. CCr ²⁺ Cr ³⁺ Cu ²⁺ Cu ⁺
  4. DCr ³⁺ Cr ²⁺ Cu ⁺ Cu ²⁺

Correct answer

C. Cr ²⁺ Cr ³⁺ Cu ²⁺ Cu ⁺

Step-by-step solution

Cu ⁺:[ Ar ] 3 ~d ¹⁰ , Spin only magnetic moment =0 B.M. Cu ⁺²:[ Ar ] 3 ~d ^9 , Spin only magnetic moment = 3 B.M. Cr ⁺²:[ Ar ] 3 ~d ^4 , Spin only magnetic moment = 24 B.M. Cr ⁺³:[ Ar ] 3 ~d ^3 , Spin only magnetic moment = 15 B.M. Order of : Cr ⁺² Cr ⁺³ Cu ⁺² Cu ⁺

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