Which of CFSE of a free Co(II) ion on forming the tetrahedral chloro complex $[C o C l_{4}]^{2 -}$ (in the units of $Δ_{o})$ ?

-0.6

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-1.2

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-1.8

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-2.4

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Solution

The correct option is B -1.2
$[C o C l_{4}]^{2 -}$ - Co electronic configuration is $[A r] 3 d^{7}$
CFSE energy for tetrahedral geometry is 4(-0.6) +3(0.4) = -1.2 $Δ_{0}$

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The CFSE for octahedral $[C o C l_{6}]^{4 -}$ is 18000 $c m^{- 1}$ . The CFSE for tetrahedral $[C o C l_{4}]^{2 -}$ will be

[C o C l_{6}]^{4 -}

18, 000 c m^{- 1}

[C o C l_{4}]^{2 -}

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