Q.

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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a

all ligands are equally strong

b

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

c

CN is the strongest ligand

d

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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