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a
FeCO5
b
K3FeCN6
c
CuNH34SO4
d
CoNH36Cl3
answer is C.
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Detailed Solution
According to EAN rule in complex compounds central metal Atom/ion with Inert g as atomic Number of electros in stable. But in CuNH34SO4EAN= central atom atomic Number- It’s oxidation Number + 2 × coordination Number =29−2+2×4= 27+8=35