Q.

Among the following complexes the one which shows zero crystal field stabilization energy (CFSE) is

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answer is 2.

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Detailed Solution

H2O is a weak field ligand, hence Δo< pairing  energyCFSE=(-0.4x+0.6y)Δowhere, x and y are no. of electrons occupying t2gand eg orbitals respectively. For FeH2O63+ complex ion, Fe3+3d5=t2g3eg2=-0.4×3+0.6×2=0.0 or 0Dq
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