A) \[{{[Pd{{(CN)}_{4}}]}^{4-}}\]
B) \[[Fe{{(CO)}_{5}}]\]
C) \[{{[Ni{{(CN)}_{4}}]}^{4-}}\]
D) \[{{[Ni{{(CN)}_{4}}]}^{3-}}\]
Correct Answer: B
Solution :
Stability of a complex depends upon the strength of ligand and charge of the central metal ion. Stability of complex \[\propto \] strength of ligand \[\propto \]charge of central metal ion. Among the given complexes, in \[{{[Ni{{(CN)}_{4}}]}^{3-}}\], the charge of central metal ion is highest, ie, +1 while CO is the strongest field ligand. Hence, \[[Fe{{(CO)}_{5}}]\] is the most stable complex among the given complexes.
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