JEE Mains · Chemistry · STD 12 - 5. Co-ordination chemistry
Given below are two statements :
Statement I: \(\left[ CoBr _4\right]^{2-}\) ion will absorb light of lower energy than \(\left[ CoCl _4\right]^{2-}\) ion.
Statement II: In \(\left[ CoI _4\right]^{2-}\) ion, the energy separation between the two set of d-orbitals is more than \(\left[ CoCl _4\right]^{2-}\) ion.
In the light of the above statements, choose the correct answer from the options given below :
- A Both Statement I and Statement II are false
- B Statement I is true but Statement II is false
- C Statement I is false but Statement II is true
- D Both Statement I and Statement II are true
Answer & Solution
Correct Answer
(B) Statement I is true but Statement II is false
Step-by-step Solution
Detailed explanation
Statement 1 (True) Strength of ligand: \(Cl^{-}>Br^{-}\) \(\Delta_{t}:[CoCl_{4}]^{2}>[CoBr_{4}]^{2-}\) \(E_{absorbed}:[CoCl_{4}]^{2-}>[CoBr_{4}]^{2-}\) Statement 2 (False) Strength of ligand : \(I ^{-}< Cl ^{-}\) \(\Delta_{t}:[CoI_{4}]^{2-}<[CoCl_{4}]^{2-}\)
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