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JEE Main levelSingle correct optionDifficulty 2 of 3cc024

Treat $H X_{2} O$ as a weak-field ligand and ignore pairing energy. The CFSE of $[Mn (H X_{2} O) X_{6}] X^{2 +}$ , in units of $Δ_{o}$ , is

A $- 2.0$
B $- 0.4$
C $- 1.2$
D0

Answer: D

Mn(II) is

d^{5}

and high spin,

t_{2 g}^{3} e_{g}^{2}

. CFSE

= - 0.4 \times 3 + 0.6 \times 2 = - 1.2 + 1.2 = 0

.

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