Give the correct of initials T or F for following statements. Use T if statement is true and F if it is false.
(I) Co(III) is stabilised in presence of weak field ligands, while Co(II) is stabilise

Question

Give the correct of initials T or F for following statements. Use T if statement is true and F if it is false.
(I) Co(III) is stabilised in presence of weak field ligands, while Co(II) is stabilised in presence of strong field ligand.
(II) Four coordinated complexes of Pd(II) and Pt(II) are diamagnetic and square planar.
(III) [Ni(CN)4]^4- ion and [Ni(CO)4] are diamagnetic tetrahedral and square planar respectively.
(IV) Ni^2+ ion does not form inner orbital octahedral complexes.

Prashant Kotian · Accepted Answer

Correct answer: D. Step 1: Octahedral crystal field stabilization energy is given by: CFSE = [-0.4 * n(t_2g) + 0.6 * n(eg)] * δ_o. For weak field (high spin) configurations, we calculate the CFSE for different d-electron counts. Step 2: We find that both the d^2 configuration (t_2g^2 eg^0) and the high-spin d^7 configuration (t_2g^5 eg^2) yield a CFSE of exactly -0.8δ_o. Step 3: For d^2, there are 2 unpaired electrons, so μ = \sqrt{2(2+2)} = \sqrt{8} BM. For d^7, there are 3 unpaired electrons, so μ = \sqrt{3(3+2)} = \sqrt{15} BM. Since both magnetic moments are possible, option (c) is correct.

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