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JEE MAIN - Chemistry (2025 - 29th January Morning Shift - No. 4)

The correct increasing order of stability of the complexes based on $\Delta_0$ value is :

  1. I. $[\text{Mn}(\text{CN})_6]^{3-}$

  2. II. $[\text{Co}(\text{CN})_6]^{4-}$

  3. III. $[\text{Fe}(\text{CN})_6]^{4-}$

  4. IV. $[\text{Fe}(\text{CN})_6]^{3-}$
I < II < IV < III
IV < III < II < I
III < II < IV < I
II < III < I < IV

Explanation

$$\begin{array}{ll} \text { (I) }\left[\mathrm{Mn}(\mathrm{CN})_6\right]^{3-} & -1.6 \Delta_o \\ \text { (II) }\left[\mathrm{Co}(\mathrm{CN})_6\right]^{4-} & -1.8 \Delta_{\circ} \\ \text { (III) }\left[\mathrm{Fe}(\mathrm{CN})_6\right]^4 & -2.4 \Delta_{\mathrm{o}} \\ \text { (IV) }\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-} & -2.0 \Delta_{\mathrm{o}} \\ \text { I }<\text { II }<\text { IV }<\text { III } & \end{array}$$

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