Which of the following complex compound(s) is/are paramagnetic and low spin?
(I) $\mathrm{K}_{3}\left[\mathrm{Fe}\left(\mathrm{CN}_{6}ight)ight]$
(II) $\left[\mathrm{Ni}(\mathrm{CO})_{4}ight]^{0}$
(III) $\left[\mathrm{Cr}\left(\mathrm{NH}_{3}ight)_{6}ight]^{3+}$
(IV) $\left[\mathrm{Mn}(\mathrm{CN})_{6}ight]^{4-}$
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Question

Aicharya · Accepted Answer

$\mathrm{Fe}^{3+}$ in $\left[\mathrm{Fe}\left(\mathrm{CN}_{6}ight)ight]^{3-}$

$\Rightarrow$ low spin complex $\mu=1.732 \mathrm{BM}$ Ni in $\left[\mathrm{Ni}(\mathrm{CO})_{4}ight]$

$\Rightarrow$ low and high spin complex is applicable for $\mathrm{d}^{4}$ to $\mathrm{d}^{7}$ configuration
$\mathrm{Mn}^{2+}$ in $\left[\mathrm{Mn}(\mathrm{CN})_{6}ight]^{4-}$

$\Rightarrow$ low spin complex $\mu=1.732 \mathrm{BM}$ .

Which of the following complex compound(s) is/are paramagnetic and low spin? (I)…

Solution