#CN ligand

What is the charge on the coordination sphere in [Fe(CN)5NO]2−?

In [Fe(CN)5NO]2−, NO is NO+ (+1), 5 CN− = −5. Overall charge is −2. Thus, x + (−5) + 1 = −2, x = +2, but the sphere’s charge is −2.

Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Werner's Theory and Definitions - Ligands Coordination Number