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# The hybridisation of iron in $K_4[Fe(CN)_6]$

$(a)\;dsp^2\qquad(b)\;sp^3\qquad(c)\;d^2sp^3\qquad(d)\;d^2sp^2$

The hybridisation of iron in $K_4[Fe(CN)_6]$ is $d^2sp^3$
Hence (c) is the correct answer.