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Answer the following.
Answer the following questions with respect to the coordination complex ion : (a) What is the…
Answer the following questions with respect to the coordination complex ion $[\text{Cr}(\text{NH}_3)_6]^{3+}$:
(a) What is the hybridisation state of the central metal atom?
(b) Comment on the magnetic nature of the complex ion.
Answer
Answer
Official answer key| Formula | [Cr(NH3)6]3+ |
| Oxidation state | 3 |
| d electrons | 3 |
| Hybridisation | d2sp3 |
| Shape | octahedral |
| Magnetic behaviour | paramagnetic |
| Unpaired electrons | 3 |
(a) Hybridisation: $d^2sp^3$ (inner orbital octahedral complex).
(b) Paramagnetic, because $\mathrm{Cr^{3+}}$ ($d^3$) has three unpaired electrons.
From ISC 2027 Specimen Chemistry Paper 1, question 4(i).
Check your working with the Coordination complex analyser: hybridisation, shape, magnetic moment, CFSE, isomers and the IUPAC name of a complex.