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Answer the following about the coordination compound.
is a coordination complex ion. (1) Calculate the oxidation number of iron in the complex. (2) Is…
$[\text{Fe}(\text{CN})_6]^{4-}$ is a coordination complex ion.
(1) Calculate the oxidation number of iron in the complex.
(2) Is the complex ion diamagnetic or paramagnetic?
(3) What is the hybridisation state of the central metal atom?
(4) Write the IUPAC name of the complex ion.
Answer
Answer
AI| IUPAC name | hexacyanidoferrate(II) |
| Oxidation state | 2 |
| Hybridisation | d2sp3 |
| Magnetic behaviour | diamagnetic |
(1) $x + 6(-1) = -4$, so iron is $+2$ ($3d^6$). (2) $\mathrm{CN^-}$ is a strong field ligand, so the electrons pair up: no unpaired electrons, diamagnetic. (3) $\mathrm{d^2sp^3}$ (inner orbital, octahedral). (4) Hexacyanidoferrate(II) ion.
From ISC 2019 Chemistry Paper 1, question 12(ii).
Check your working with the Coordination complex analyser: hybridisation, shape, magnetic moment, CFSE, isomers and the IUPAC name of a complex.