question_answer 60)

    An aqueous pink solution of cobalt (II) chloride changes to deep blue on addition of excess of HCl. This is because.......... (a)  is transformed into (b)  is transformed into (c) tetrahedral complexes have smaller crystal field splitting than octahedral complexes (d) tetrahedral complexes have larger crystal field splitting than octahedral complex

Answer:

                    (b, c) Aqueous pink solution of cobalt (II) chloride is due to electronic transition of electron from  to  energy level of  complex. When excess of HCl is added to this solution (i) is transformed into . (ii) Tetrahedral complexes have smaller crystal field splitting than octahedral complexes because Hence, options (b) and (c) are correct choices.