NEET2026ChemistryChapterActual
What is the correct IUPAC name for the coordination compound [Co(NH₃)₆][Cr(CN)₆] ?
Options
- Ahexaamminecobaltate(III) hexacyanidochromium(III)
- Bhexaamminecobalt(II) hexacyanidochromate(IV)
- Chexacyanidochromate(III) hexaamminecobalt(III)
- Dhexaamminecobalt(III) hexacyanidochromate(III)
Correct answer
D. hexaamminecobalt(III) hexacyanidochromate(III)
Step-by-step solution
The given coordination compound is [Co(NH₃)₆][Cr(CN)₆] . The complex consists of a cationic part [Co(NH₃)₆]^ x+ and an anionic part [Cr(CN)₆]^ y- . Let the oxidation states of Co and Cr be +3 each, which are their most stable and common oxidation states in such coordination spheres. This gives the cation as [Co(NH₃)₆]³⁺ and the anion as [Cr(CN)₆]³⁻ , balancing the charges. According to IUPAC nomenclature rules, the cation is named first followed by the anion. For the complex cation [Co(NH₃)₆]³⁺ , the ligand is ammi