Which complex is most stable? Where $k_d =$ Dissociation constant.
- A$[Cu(CN)_2]^-; k_d = 1 \times 10^{-16}$
- B$[Fe(CN)_6]^{4-} ; k_d = 1 \times 10^{-37}$
- C$[Fe(CN)_6]^{3-} ; k_d = 1 \times 10^{-44}$
- D$[Ag(CN)_2]^-; k_d = 1 \times 10^{-20}$
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