The crystal field stabilising energy for [CoCl₆]^4– is 18000 Cm^–1. Then the C.F.S.E for [CoCl₄]^2– will be

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6000cm^–1

16000cm^–1

18000cm^–1

8000cm^–1

answer is D.

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Detailed Solution

[(CoCl₆]⁴⁻ and [CoCl₄]²⁻have octahedral and tetrahedral geometries respectively.

For [(CoCl₆]⁴⁻, the CFSE Δo=18000cm⁻¹.

The relationship between the crystal field stabilization energies for octahedral and tetrahedral field is Δt=94Δo
Substitute value in the above expression.
[CoCl₄]²⁻=4/9×18000cm−1=8000cm⁻¹.

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