A d - block metal X ( Z =26) forms a compound [ X ( CN )₂( CO )₄]⁺ . Calculate its spin magnetic moment value.

Step-by-step solution

The metal X is Iron (Fe) with atomic number Z = 26 . The electronic configuration of Fe is [Ar] 3d⁶ 4s² . In the complex [Fe(CN)₂(CO)₄]⁺ , let the oxidation state of Fe be x . Since CN⁻ is -1 and CO is neutral, we have x + 2(-1) + 4(0) = +1 , which gives x = +3 . The electronic configuration of Fe³⁺ is [Ar] 3d⁵ . Both CN⁻ and CO are strong field ligands. According to crystal field theory, strong field ligands cause pairing of electrons in the d -orbitals. For a d⁵ configuration with strong field ligands, the electr