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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)
Detailed Solution
(1) $[Mn(CN)_6]^{3-}$: $d^2sp^3$, $Mn^{3+}=3d^4$ (low spin) $\Rightarrow$ n = 2. (2) $[Fe(CN)_6]^{3-}$: $Fe^{3+}=3d^5$ (low spin) $\Rightarrow$ n = 1. (3) $[Co(NH_3)_6]^{3+}$: $Co^{3+}=3d^6$ (low spin) $\Rightarrow$ n = 0. (4) $[Ti(H_2O)_6]^{3+}$: $Ti^{3+}=3d^1 \Rightarrow$ n = 1. $[Mn(CN)_6]^{3-}$ has the maximum number of unpaired electrons, so the highest spin-only magnetic moment.