In $\left[ MnCl _4\right]^2: d^5$ configuration and $5$ unpaired electrons
In $\left[ CoCl _4\right]^2: d^7$ configuration and $3$ unpaired electrons
In $\left[ Fe ( CN )_6\right]^4: d ^6$ configuration, low spin complex and o unpaired electrons
More the number of unpaired electrons, more the value of magnetic moment.
Hence, the order is $\left[ MnCl _4\right]^{2-} > \left[ CoCl _4\right]^{2-} > \left[ Fe ( CN )_6\right]^{4-}$
સૂચિ $I$ સંકીર્ણ | સૂચિ $II$ $CFSE(\Delta_0)$ |
$A$ $\left[ Cu \left( NH _3\right)_6\right]^{2+}$ | $I$ $-0.6$ |
$B$ $\left[\operatorname{Ti}\left( N _2 O \right)_6\right]^{3+}$ | $II$ $-2.0$ |
$C$ $\left[ Fe ( CN )_6\right]^{3-}$ | $III$ $-1.2$ |
$D$ $\left[ NiF _6\right]^{4-}$ | $IV$ $-0.4$ |
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