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The correct increasing order of stability of the complexes based on Δ o value is : (I) [Mn(CN) 6 ] 3– (II) [Co(CN) 6 ] 4– (III) [Fe(CN) 6 ] 4– (IV) [Fe(CN) 6 ] 3–

1. II < III < I < IV
2. IV < III < II < I
3. I < II < IV < III
4. III < II < IV < I

Correct answer: I < II < IV < III

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