An aqueous pink solution of cobalt(II) chloride changes to deep blue on addition of excess of HCl. This is because____________.
1
[Co(H2O)6]2+ is transformed into [CoCl6]4–
2
[Co(H2O)6]2+ is transformed into [CoCl4]2–
3
tetrahedral complexes have smaller crystal field splitting than octahedral complexes.
4
tetrahedral complexes have larger crystal field splitting than octahedral complex.