Q. 18

An aqueous pink s A. [Co(H2O)6]2+ is transformed into [CoCl6]4–

B. [Co(H2O)6]2+ is transformed into [CoCl4]2–

C. tetrahedral complexes have smaller crystal field splitting than octahedral complexes.

D. tetrahedral complexes have larger crystal field splitting than octahedral complex.

Answer :

Pink colour is due to transition of electrons from t2g to eg orbitals. When an excess of HCl is added, [Co(H2O)6]2+ is transformed into [CoCl4]2–. Also, tetrahedral complexes have smaller crystal field splitting than octahedral complexes, so the crystal field splitting energy is low, the wavelength absorbed will be higher(towards red) but the complementary colour observed will be blue.


Thus, Options B & C are the correct answers.

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