The coordination sphere of K₄[Fe(CN)₆] is

Question

Accepted Answer

A. {'text': 'The [Fe(CN)₆]⁴⁻ inner-bracket group', 'label': 'A'}

1. NCERT 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: NCERT Class 12 Chemistry, Unit 5 "Coordination Compounds", §5.2(e)_

Answer

{'text': 'The four K⁺ counter ions', 'label': 'B'}

Answer

{'text': 'The six free CN⁻ ligand molecules', 'label': 'C'}

Answer

{'text': 'The overall neutral K₄Fe skeleton', 'label': 'D'}