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The total crystal field stabilization energy (CSFE) for the complexes ${[Co {(H_{2} O)}_{6}]}^{3 +}$ and ${[{CoF}_{6}]}^{3 -}$ are respectively : (P is the pairing energy)

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$- 24 d q + 2 P$ and $- 24 d q + 2 P$

$- 24 d q + 2 P$ and $- 4.0 d q$

$- 4.0 d q$ and $- 4.0 d q$

$4.0 d q$ and 0

answer is B.

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Detailed Solution

${[Co {(H_{2} O)}_{6}]}^{3 +}$ has $d^{6}$ result in $CFSE = - 2.4 Δ_{0} + 2 P$

${[{CoF}_{6}]}^{3 -}$ has $d^{6}$ result in $C F S E = - 1.6 Δ_{0} + 1.2 Δ_{0}$

Hence correct option is B

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