Question

when C0Cl2 is dissolved in water, a pale coloured pink solution is obtained. On adding conc. HCL the solution turns an intense blue colour . Suggest structures for the pink and the blue complexes, and draw the appropriate orbital splitting diagrams. What is the reason for the change in colour? Calculate the spin-only magnetic moments of the two complexes you propose.

Answer 1

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i), (iii) (ii) [Co(H2O)6]2+ is transformed into [CoCl4]2– (iii) tetrahedral complexes have smaller crystal field splitting than octahedral complexes.

Answer 2

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