Sarthaks Test
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An aqueous pink solution of cobalt(II) chloride changes to deep blue on addition of excess of HCl. This is because____________.

(i) [Co(H2O)6]2+ is transformed into [CoCl6]4–

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

(iii) tetrahedral complexes have smaller crystal field splitting than octahedral complexes.

(iv) tetrahedral complexes have larger crystal field splitting than octahedral complex.

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(ii), (iii)

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

(iii) tetrahedral complexes have smaller crystal field splitting than octahedral complexes.

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