Question bank/NEET UG/Chemistry

NEET UGChemistryModerateRe-NEET 2026

Among the species given below, the spin-only magnetic moment is highest for
(Given: Atomic number of Ti = 22, Mn = 25, Fe = 26 and Co = 27)

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Sol. In [Ti(H2O)6]3+⇒Ti3+⇒[Ar]4s03d1[Ti(H_2O)_6]^{3+} \Rightarrow Ti^{3+} \Rightarrow [Ar] 4s^0 3d^1

Number of unpaired electron = 1

In [Mn(CN)6]3−⇒Mn3+⇒[Ar]4s03d4[Mn(CN)_6]^{3-} \Rightarrow Mn^{3+} \Rightarrow [Ar] 4s^0 3d^4

Number of unpaired electrons = 2

<image_1>

In [Fe(CN)6]3−⇒Fe3+⇒[Ar]4s03d5[Fe(CN)_6]^{3-} \Rightarrow Fe^{3+} \Rightarrow [Ar] 4s^0 3d^5

<image_2>

Number of unpaired electron = 1

Source: geekyrakshit/indian-exam-questions / reneet2026-code50

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