Statement I: ion will absorb light of lower energy than ion. Statement II: In ion, the energy separation between the two sets of d-orbitals is more than ion. [2026]

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Q.
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 sets 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: [2026]

1 Both Statement I and Statement II are true

2 Statement I is true but Statement II is false

3 Both Statement I and Statement II are false

4 Statement I is false but Statement II is true

Ans.
(2)

$Statement 1 (True)$

Strength of ligand : ${Cl}^{-} > {Br}^{-}$

$Δ_{t} : {[{CoCl}_{4}]}^{2 -} > {[{CoBr}_{4}]}^{2 -}$

$E_{absorbed} : {[{CoCl}_{4}]}^{2 -} > {[{CoBr}_{4}]}^{2 -}$

$Statement 2 (False)$

Strength of ligand : $I^{-} < {Cl}^{-}$

$Δ_{t} : {[{CoI}_{4}]}^{2 -} < {[{CoCl}_{4}]}^{2 -}$

Solution

1 Both Statement I and Statement II are true

2 Statement I is true but Statement II is false

3 Both Statement I and Statement II are false

4 Statement I is false but Statement II is true

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Solution

1 Both Statement I and Statement II are true

2 Statement I is true but Statement II is false

3 Both Statement I and Statement II are false

4 Statement I is false but Statement II is true

Ans. (2) Statement 1 (True) Strength of ligand : Cl->Br- Δt:[CoCl4]2->[CoBr4]2- Eabsorbed:[CoCl4]2->[CoBr4]2- Statement 2 (False) Strength of ligand : I-<Cl- Δt:[CoI4]2-<[CoCl4]2-

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