Which of the following is/are paramagnetic complex(es)?

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${[Fe {({NH}_{9})}_{6}]}^{3 +}$

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

$[Fe (CO)_{\tilde{5}}]$

$[Co {(N I {[_{3})}_{6}]}^{3 +}$

answer is D, A.

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Detailed Solution

(a) $t_{2 g}^{2, 1, 1} e_{g}^{1, 1}$ Because of the weak field ligand present in the molecule, electrons are not coupled up. Consequently, the substance is described as paramagnetic. Since F is a weak field ligand, it will contain 4 unpaired electrons. Thus, the substance is paramagnetic.

(d) $s p^{3} d^{2}$ with u.p. $e^{-}$ in $3 d$

is paramagnetic because it has an unpaired electron and a strong field ligand (low-spin complex).

Co is a d 7 electron system since it is in the +2 oxidation state in this instance.

All electrons couple together in the presence of a strong ligand, leaving one electron unpaired.

So, 1 is the right response.

Hence correct option is (a, d).

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