ChemistryJEE Main 23 Jan 2026, Shift 2·Q24·Numerical·Easy–moderate

Coordination Compounds · Unpaired electrons in complexes

Total number of unpaired electrons present in the central metal atoms/ions of

\ce{[Ni(CO)4]}

\ce{[NiCl4]^{2-}}

\ce{[PtCl2(NH3)2]}

\ce{[Ni(CN)4]^{2-}}

and

\ce{[Pt(CN)4]^{2-}}

is .

We corrected a printing error in the original paper

Source printed “[Ni(CN $_4$ )] $^{2-}$ ” and “[Pt (CN $_4$ )] $^{2-}$ ”.

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