Verified Solution • 2025–26 Session moderate

QJEEM25Ch1c38: JEE Main 2025 Chemistry - Class 12 JEEM25Ch1c38 Solution: The correct increasing order of stability of the complexes…

The correct increasing order of stability of the complexes based on Δ0\Delta_0 value is :

  1. I. [Mn(CN)6]3−[\text{Mn}(\text{CN})_6]^{3-}

  2. II. [Co(CN)6]4−[\text{Co}(\text{CN})_6]^{4-}

  3. III. [Fe(CN)6]4−[\text{Fe}(\text{CN})_6]^{4-}

  4. IV. [Fe(CN)6]3−[\text{Fe}(\text{CN})_6]^{3-}

Multiple Choice Options

  • A I < II < IV < III
  • B IV < III < II < I
  • C III < II < IV < I
  • D II < III < I < IV

Step-by-Step Verified Solution

 (I) [Mn(CN)6]3−amp;−1.6Δo (II) [Co(CN)6]4−amp;−1.8Δ∘ (III) [Fe(CN)6]4amp;−2.4Δo (IV) [Fe(CN)6]3−amp;−2.0Δo I lt; II lt; IV lt; III amp;\begin{array}{ll}\text { (I) }\left[\mathrm{Mn}(\mathrm{CN})_6\right]^{3-} &amp; -1.6 \Delta_o \\\text { (II) }\left[\mathrm{Co}(\mathrm{CN})_6\right]^{4-} &amp; -1.8 \Delta_{\circ} \\\text { (III) }\left[\mathrm{Fe}(\mathrm{CN})_6\right]^4 &amp; -2.4 \Delta_{\mathrm{o}} \\\text { (IV) }\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-} &amp; -2.0 \Delta_{\mathrm{o}} \\\text { I }&lt;\text { II }&lt;\text { IV }&lt;\text { III } &amp;\end{array}

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