Practice question

Given: What is the oxidation state of iron in K₄[Fe(CN)6] ? These values define the system as per NCERT data. Formula: Each CN^- is -1, 6 ligands = -6. This is standard NCERT relation. Substitution & Calculation: The complex [Fe(CN)6]^{4- is balanced by 4 K⁺, so Fe’s oxidation state is x - 6 = -4, x = +2 . Result: The computed value matches expected outcome and confirms correct choice as per NCERT.