MHT CET Medical202622 April 2026Morning ShiftChemistryCoordination CompoundsActual
What is the IUPAC name of K ₃[ Co ( C ₂ O ₄)₃] ?
Options
- APotassium tris(oxalato)cobalt(III)
- BPotassium tris(oxalato)cobaltate(III)
- CPotassium trioxalatocobaltate(III)
- DPotassium trioxalatocobalt(III)
Correct answer
C. Potassium trioxalatocobaltate(III)
Step-by-step solution
The given coordination compound is K ₃[ Co ( C ₂ O ₄)₃] . The cation is potassium, which is written first. The complex part is an anion, [ Co ( C ₂ O ₄)₃]³⁻ . For anionic complexes, the name of the central metal ends with the suffix '-ate'. Thus, cobalt becomes cobaltate. The ligand is oxalate ( C ₂ O ₄²⁻ ), which is named 'oxalato'. Since there are three oxalate ligands, the prefix 'tri' is used, giving 'trioxalato'. Let the oxidation state of cobalt be x . The charge on one oxalate ligand is -2 . The sum of oxida