MolSynapsequestion bank

MolSynapse / Question bank / Coordination Compounds / IUPAC nomenclature

JEE Advanced levelSingle correct optionDifficulty 3 of 3cc083

A complex $K X_{x} [Fe (CN) X_{6}]$ contains iron in the +2 or +3 state and has a spin-only moment of 1.73 BM (CN- is strong field). Its IUPAC name is

Atripotassium hexacyanidoferrate(III)
Bpotassium hexacyanidoiron(III)
Cpotassium hexacyanidoferrate(III)
Dpotassium hexacyanidoferrate(II)

Answer: C

1.73 BM means one unpaired electron. Low-spin

d^{6}

Fe(II) has zero, while low-spin

d^{5}

Fe(III) has one, so iron is +3 and

x = 3

. The anion takes the ferrate form, and the counter-ion has no numerical prefix.

Practice Coordination Compounds More on IUPAC nomenclature

Previous questionNext question

More questions on IUPAC nomenclature