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The CFSE for octahedral $\left [ \text {CoCl}_{6} \right ]^{4-}$ is 18,000 cm^–1. The CFSE for tetrahedral $\left [ \text {CoCl}_{4} \right ]^{2-}$ will be

(i) 18,000 $\text {cm}^{-1}$

(ii) 16,000 $\text {cm}^{-1}$

(iii) 8,000 $\text {cm}^{-1}$

(iv) 20,000 $\text {cm}^{-1}$

Answers (1)

Option (iii) is the correct answer.

Explanation :

(c) CFSE for tetrahedral complex is $\Delta _{t}=\left ( \frac{4}{9} \right )\Delta _{0}$

$\Delta _{t}=\frac{4}{9} \times 18000=8,000 \; \text {cm}^{-1}$

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