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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3cc046

Ignoring pairing energy, which of the following complexes have zero crystal field stabilisation energy? (The tetrahedral complex is high spin.)

A $[Zn (H X_{2} O) X_{6}] X^{2 +}$
B $[FeCl X_{4}] X^{-}$ (tetrahedral)
C $[Ti (H X_{2} O) X_{6}] X^{3 +}$
D $[CoCl X_{4}] X^{2 -}$ (tetrahedral)

Answer: A, B

Zn(II) is

d^{10}

:

t_{2 g}^{6} e_{g}^{4}

gives

- 2.4 + 2.4 = 0

. Fe(III) is

d^{5}

: tetrahedral

e^{2} t_{2}^{3}

gives

- 1.2 + 1.2 = 0

. Ti(III) is

d^{1}

with CFSE

- 0.4 Δ_{o}

. Co(II) is

d^{7}

:

e^{4} t_{2}^{3}

gives

- 2.4 + 1.2 = - 1.2 Δ_{t}

.

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