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Q.

The d-electron configurations of ${Mn}^{2 +}, {Fe}^{2 +}, {Co}^{3 +} and {Ni}^{2 +}$ are 3d⁵ , 3d⁶, 3d⁶, 3d⁸, respectively. Which of the following aqua complexes will exhibit the minimum paramagnetic behaviour?

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a

${[Co {(H_{2} O)}_{6}]}^{3 +}$

b

${[Mn {(H_{2} O)}_{6}]}^{2 +}$

c

${[Fe {(H_{2} O)}_{6}]}^{2 +}$

d

${[Ni {(H_{2} O)}_{6}]}^{2 +}$

answer is B.

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Detailed Solution

${[Co {(H_{2} O)}_{6}]}^{3 +} = d^{2} {sp}^{3}$

low spin, diamagnetic, magnetic moment - zero BM

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The d-electron configurations of Mn2+,Fe2+,Co3+ and Ni2+are 3d5 , 3d6, 3d6, 3d8, respectively. Which of the following aqua complexes will exhibit the minimum paramagnetic behaviour?