The d-electron configuration of $\mathrm{Cr^{2+}}$, $\mathrm{Mn^{2+}}$, $\mathrm{Fe^{2+}}$ and $\mathrm{Co^{2+}}$ are $d^4$, $d^5$, $d^6$ and $d^7$ respectively. Which one of the following will exhibit minimum paramagnetic behavior?
- A$[\mathrm{Mn(H_2O)_6}]^{2+}$
- B$[\mathrm{Fe(H_2O)_6}]^{2+}$
- C$[\mathrm{Co(H_2O)_6}]^{2+}$
- D$[\mathrm{Cr(H_2O)_6}]^{2+}$
✓ Correct answer: C
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