Question

Which complex is more stable and why k4fe(cn)6 or k3fe(cn)6?

Answer 1

As Fe2+  is more stable than Fe3+ due to principle of half-filled orbitals .
In  K4Fe(CN)6   ,  Fe is in oxidation state of +2
in  K3Fe(CN)6    ,  Fe  is  in oxidation state of +3

hence , K3Fe(CN)6 is more stable .

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Answer 2

k4fe(cn)6 or k3fe(cn)6 we have to compare this

k4fe(cn)6 it forms $k^+ + [feCn_{6} ]^4-$  when it dissociates.

charge on this compound is $x + 1*(6) -4 = 0\ \x = 2$

oxidation state = +2

k3fe(cn)6 it forms $k^+ + [ feCn_6]^3-$ when it dissociates.

charge on this compound is

$x + 1(6) - 3 = 0\\x = 3$

oxidation state is +3

Higher the oxidation state of the central item in the complex, higher is the stabillity.

therefore, k3[FeCn)6 is more stable.