The \( d \) electron configuration of \( \mathrm{Cr}^{2+}, \mathrm{Mn}^{2+}, \mathrm{Fe}^{2+} \)...

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The \( d \) electron configuration of \( \mathrm{Cr}^{2+}, \mathrm{Mn}^{2+}, \mathrm{Fe}^{2+} \) and \( \mathrm{Ni}^{2+} \) are \( 3 d^{4}, 3 d^{5}, 3 d^{6} \) and \( 3 d^{8} \) respectively. Which one of the following aqua complexes will exhibit the maximum paramagnetic behaviour? (At. No. \( \mathrm{Cr}= \) \( 24, \mathrm{Mn}=25, \mathrm{Fe}=26, \mathrm{Ni}=28 \) )
\( \mathrm{P} \)
(1) \( \left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+} \)
(2) \( \left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+} \)
(3) \( \left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+} \)
(4) \( \left[\mathrm{Mn}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+} \)
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