What is CFSE of a free Co(II) ion on forming the tetrahedral chloro complex [CoCl_4]^ 2- (in the units of _0)

JEE Advanced Chemistry question

What is CFSE of a free ion on forming the tetrahedral chloro complex (in the units of )

(A)0.6
(B)1.2
(C)1.8Correct
(D)2.4

Answer: (C)

Solution

is . In the tetrahedral field of the weak-field ligand (always high spin in tetrahedral geometry), the configuration is . Using the tetrahedral CFSE formula ;

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Question ID VK-160035