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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3cc067

Select the correct statements about tetrahedral complexes (CFSE in units of $Δ_{t}$ , pairing ignored, high-spin filling).

AThe $e$ set lies lower in energy than the $t_{2}$ set
BA $d^{10}$ ion has zero CFSE
CA $d^{2}$ ion has CFSE $= - 1.2 Δ_{t}$
DA $d^{5}$ ion has CFSE $= - 0.4 Δ_{t}$

Answer: A, B, C

In a tetrahedron

e

lies at

- 0.6 Δ_{t}

and

t_{2}

at

+ 0.4 Δ_{t}

.

d^{2}

:

e^{2}

gives

2 (- 0.6) = - 1.2

.

d^{10}

:

4 (- 0.6) + 6 (0.4) = 0

.

d^{5}

:

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

gives

- 1.2 + 1.2 = 0

, not

- 0.4

.

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