Which of the following complexes does not fol | vedclass

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(B) The $EAN$ (Effective Atomic Number) rule states that the total number of electrons around the central metal ion in a complex should be equal to th

Vedclass · Accepted Answer

Potassium ferricyanide

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(B) The $EAN$ (Effective Atomic Number) rule states that the total number of electrons around the central metal ion in a complex should be equal to the atomic number of the next noble gas.$1$. Potassium ferrocyanide: $K_4[Fe(CN)_6]$. $Fe$ is in $+2$ state. $EAN = 26 - 2 + (6 	imes 2) = 36$ (Follows).$2$. Potassium ferricyanide: $K_3[Fe(CN)_6]$. $Fe$ is in $+3$ state. $EAN = 26 - 3 + (6 	imes 2) = 35$ (Does not follow).$3$. Tetracarbonyl nickel: $[Ni(CO)_4]$. $Ni$ is in $0$ state. $EAN = 28 - 0 + (4 	imes 2) = 36$ (Follows).$4$. Cobalt $(III)$ hexaammine chloride: $[Co(NH_3)_6]Cl_3$. $Co$ is in $+3$ state. $EAN = 27 - 3 + (6 	imes 2) = 36$ (Follows).Therefore,potassium ferricyanide does not follow the $EAN$ rule.

Which of the following complexes does not follow the $EAN$ rule?

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