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Question

The CFSE for octahedral [CoCl6]4 is 18,000cm1.
The CFSE for tetrahedral [CoCl4]2 will be

A
18,000cm1
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B
16,000cm1
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C
8,000cm1
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D
20,000cm1
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Solution

The correct option is C 8,000cm1
The crystal field splitting in the tetrahedral field is intrinsically smaller than in the octahedral field. For most purposes the relationship may be represented as Δt=49Δo
Δt=49(18000 cm1)=8000 cm1

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