Nomenclature Of Coordination Compounds

Step 1: Understand the composition of sodium nitroprusside
Sodium nitroprusside is a coordination compound composed of:

• A central Fe (iron) atom
• Five cyanide ligands (CN^-)
• One nitrosyl ligand (NO)
• Two Na⁺ ions to balance the charge

Step 2: Determine the correct structure
The nitrosyl (NO) group is a neutral ligand, and each cyanide (CN^-) carries a -1 charge. To neutralize the -2 charge of the complex ion, two sodium ions (Na⁺) are required.
Step 3: Final answer
The correct formula is: