Given below are two statements: Statement I: [CoBr 4 ] 2– ion will absorb light of lower energy than [CoCl 4 ] 2– ion. S…
Given below are two statements:
Statement I: [CoBr4]2– ion will absorb light of lower energy than [CoCl4]2– ion.
Statement II: In [CoI4]2– ion, the energy separation between the two set of d-orbitals is more than [CoCl4]2– ion.
In the light of the above statements, choose the correct answer from the options given below:
[JEE Main 2026, 23 Jan (Shift 1)]
Statement I is true but Statement II is false
Statement-I (True)
Strength of ligand: Cl– > Br–
\({\Delta }_{\mathrm{t}}:{\left[{\mathrm{CoCl}}_{4}\right]}^{2-}>{\left[{\mathrm{CoBr}}_{4}\right]}^{2-}\)
\({\mathrm{E}}_{\text{absorbed }}:{\left[{\mathrm{CoCl}}_{4}\right]}^{2-}>{\left[{\mathrm{CoBr}}_{4}\right]}^{2-}\)
Statement-2 (False)
Strength of ligand: I– < Cl–
\({\Delta }_{\mathrm{t}}:{\left[{\mathrm{CoI}}_{4}\right]}^{2-}<{\left[{\mathrm{CoCl}}_{4}\right]}^{2-}\)
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