In potassium ferrocyanide, there are ____ pairs of electrons in the $\mathrm{t}_{2 \mathrm{~g}}$ set of orbitals

JEE Main · 2023 · 10 Apr 2023 · Shift 1 · Coordination Compounds

In potassium ferrocyanide, there are ____ pairs of electrons in the

t_{2 g}

set of orbitals

Answer: 3

Solution

Potassium ferrocyanide is

K_{4} [Fe (CN)_{6}]

, in which iron is present as iron(II) with a

3 d^{6}

configuration. Cyanide is a strong-field ligand, so in this octahedral complex the six d electrons are driven into the lower

t_{2 g}

set, giving

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

. Six electrons filling the three

t_{2 g}

orbitals make three completely filled pairs, so there are three pairs of electrons in the

t_{2 g}

orbitals.

JEE Main · 2023 · 10 Apr 2023 · Shift 1 · Integer answer

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