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JEE Main levelSingle correct optionDifficulty 2 of 3cc025

Take $[Co (NH X_{3}) X_{6}] X^{3 +}$ to be low spin and ignore pairing energy. Its CFSE in units of $Δ_{o}$ is

A $- 1.2$
B $- 2.4$
C $- 0.4$
D $- 1.8$

Answer: B

Co(III) is

d^{6}

and low spin is

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

. CFSE

= - 0.4 \times 6 = - 2.4 Δ_{o}

. The value

- 0.4

would be for the high spin

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

.

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