alleryThe coordination sphere of K₄[Fe(CN)₆] is
AThe [Fe(CN)₆]⁴⁻ inner-bracket group
BThe four K⁺ counter ions
CThe six free CN⁻ ligand molecules
DThe overall neutral K₄Fe skeleton
Answer & Solution
Correct answer: A. The [Fe(CN)₆]⁴⁻ inner-bracket group
1. Your syllabus defines the coordination sphere as central atom + ligands in square brackets.
2. In K₄[Fe(CN)₆] the square-bracketed entity is [Fe(CN)₆]⁴⁻.
3. K⁺ ions outside the bracket are counter ions, not part of the coordination sphere.
4. So [Fe(CN)₆]⁴⁻ is the coordination sphere.
_Source: syllabus Chemistry, Unit 5 "Coordination Compounds", §5.2(e)_
Keep practising Unit 2B1: Transition Metals & Coordination Compounds
Browse all Unit 2B1: Transition Metals & Coordination Compounds questions for JEE Advanced, or explore more Chemistry topics.
Related questions
The correct IUPAC name of [NiCl₂(PPh₃)₂] isThe correct order of ligand denticity, from smallest to largest, isChelate complexes tend to be more stable than similar complexes with unidentate ligands. TThe primary and secondary valences of Co in [Co(NH₃)₆]Cl₃ are respectivelyWhich of the following is a homoleptic complex?Which coordination polyhedron does [Ni(CO)₄] adopt?The IUPAC name of [Ni(NH₃)₆]Cl₂ isWhich of these ligands is ambidentate — capable of binding through either of two different