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

1. [Mn(H2O)6]^3+
2. [Fe(H2O)6]^3+
3. [Co(H2O)6]^2+
4. [Co(H2O)6]^3+

Correct answer: [Mn(H2O)6]^3+

Solution

The complex [Mn(H2O)6]^3+ has Mn3+ with a d4 electronic configuration in a high-spin state. In an octahedral field, the CFSE for a d4 high-spin configuration is zero because the electrons are evenly distributed between t2g and eg orbitals.

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