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Stable complex based on EAN rule
i) K₄[Fe(CN)₆] ii) [Co(NH₃)₅Cl]Cl₂ iii) [Ni(CO)₄] iv) K₂[Ni(CN)₄]

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An Intiative by Sri Chaitanya

i only

i, ii & iii only

all

i & ii only

answer is C.

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Detailed Solution

EAN stands for Effective Atomic number.

It is given by formula:

EAN= Z-X+Y

where Z= Atomic number

X=number of electrons loosed by central metal ion

Y=Number of electrons shared by ligands

EAN value of complexes
atomic number of Fe , Co and Ni are 26, 27 and 28 respectively

each ligand contributes 2 electrons

=26 −2+12 =36
=27−3+12 =36
=28 +8=36
=28 −2+8=34
so its not stable as its EAN is not equal to 36.

i, ii and iii obey EAN rule

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