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Which of the following is incorrectly matched?
\( \mathrm{P} \)
(a) \( \left[\mathrm{FeF}_{6}\right]^{3-} \)
Number of unpaired electrons
5
(b) \( \left[\mathrm{Cr}(\mathrm{en})_{3}\right]^{2+} \)
(c) \( \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+} \)
(d) \( \left[\mathrm{Mn}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+} \)
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