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JEE Main20252 Apr 2025Evening ShiftChemistryCoordination CompoundsActual

The spin-only magnetic moment value of M ^ n+- ion formed among Ni , Zn Mn and Cu that has the least enthalpy of atomisation is ________. (in nearest integer) Here n is equal to the number of diamagnetic complexes among K ₂ [ NiCl ₄ ], [ Zn ( H ₂ O )₆ ] Cl ₂ , K ₃ [ Mn ( CN )₆ ] and [ Cu ( PPh ₃ )₃ I ]

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Step-by-step solution

K ₂ [ NiCl ₄ ] sp ^3 , Paramagnetic [ Zn ( H ₂ O )₆ ] Cl ₂ sp ^3 ~d ^2 , Diamagnetic K ₃ [ Mn ( CN )₆ ] d ^2 sp ^3 , Paramagnetic [ Cu ( PPh ₃ )₃ I ] sp ^3 , Diamagnetic Hence the value of n is 2 Least value of enthalpy of atomisation among Ni , Zn , Mn and Cu is of Zn aligned & Zn ⁺²:-[ Ar ] 3 ~d ¹⁰ & =0 aligned

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