Given below are two statements : Statement I : [ CoBr _ 4 ]^ 2- ion will absorb light of lower energy than [ CoCl _ 4 ]^ 2- ion. Statement II : In [ CoI _ 4 ]^ 2- ion, the energy separation between the two set of d-orbitals is more than [ CoCl _ 4 ]^ 2- ion. In the light of the above statements, choose the correct answer from the options given below :
D. Statement I is true but Statement II is false
Crystal field theory explains d-d transitions in complexes based on ligand field strength. Statement I: Ligand field strength order is I⁻ Statement II: I⁻ is a much weaker field ligand than Cl⁻. Therefore, [CoI₄]²⁻ has smaller crystal field splitting than [CoCl₄]²⁻, not larger. The energy separation in [CoI₄]²⁻ is less than in [CoCl₄]²⁻. FALSE Statement I is true but Statement II is false.
Related: Chemistry — Coordination Compounds · All PYQ Banks