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JEE Main levelSingle correct optionDifficulty 2 of 3cc109

Ignoring pairing energy, the crystal field stabilisation energy of the low-spin octahedral ion $[Fe (CN) X_{6}] X^{4 -}$ is

A $- 0.4 Δ_{o}$
B $- 0.6 Δ_{o}$
C $- 1.6 Δ_{o}$
D $- 2.4 Δ_{o}$

Answer: D

Fe is +2,

d^{6}

. CN- is strong field, so the configuration is

t_{2 g}^{6} e_{g}^{0}

.

CFSE = 6 (- 0.4) + 0 = - 2.4 Δ_{o}

.

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