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The crystal field stabilization energy of the complex \(\mathrm{[CoCl_4]^{2-}}\) is

Question and options

The crystal field stabilization energy of the complex [CoCl4]2−\mathrm{[CoCl_4]^{2-}} is
  1. 12 Dq
  2. 8 Dq
  3. 12 Dq + 2p
  4. 6 Dq + p

Answer and explanation

Correct answer: A - 12 Dq
[CoCl4]2−\mathrm{[CoCl_4]^{2-}} is tetrahedral Co(II), d7d^7: e4t23e^4t_2^3. CFSE =4(−6 Dq)+3(+4 Dq)=−12 Dq= 4(-6\,Dq) + 3(+4\,Dq) = -12\,Dq, magnitude 12 Dq, with no extra pairing energy term (high spin).

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