The stability constant of the complexes formed by a metal ion (M²⁺) with NH₃, CN^–, H₂O and en are of the order 10¹¹, 10²⁷, 10¹⁵ and 10⁸ respectively. Then –

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all ligands are equally strong

the strength of the ligands has not relation-ship with given values

CN^– is the strongest ligand

en is the strongest ligand

answer is B.

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Detailed Solution

The stability constant for the complex [M(CN)₆]⁴⁻ is maximum (10²⁷). Hence, cyanide ion is the strongest ligand. For mono dentate ligands, higher is the value of stability constant, greater is the ligand strength.

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