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ChemistryJEE Main 28 Jan 2026, Shift 2·Q19·MCQ·Easy–moderate

Coordination Compounds · Spin-only magnetic moment of complexes

The correct increasing order of spin-only magnetic moment values of the complex ions [MnBrX4]X2−\ce{[MnBr4]^2-} (A), [Cu(HX2O)X6]X2+\ce{[Cu(H2O)6]^2+} (B), [Ni(CN)X4]X2−\ce{[Ni(CN)4]^2-} (C) and [Ni(HX2O)X6]X2+\ce{[Ni(H2O)6]^2+} (D) is:
  1. (1)A == B << C << D
  2. (2)A == B << D << C
  3. (3)C == D << B << A
  4. (4)C << B << D << A
We corrected a printing error in the original paper

Source printed “[Ni(CN4_4)]2−^{2-}”.

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See the full 28 Jan 2026, Shift 2 paper