If Hund's rule is not followed then which of the following ion is paramagnetic. (A) \( \mathrm{C...

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If Hund's rule is not followed then which of the following ion is paramagnetic.
(A) \( \mathrm{Cr}^{2+} \)
(B) \( \mathrm{Fe}^{2+} \)
(C) \( \mathrm{Rh}^{+3} \)
(D) \( \mathrm{MnO}_{4}{ }^{2-} \)
\( \mathrm{P} \)
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