The IUPAC name for `[Co(NH_(3))_(6)] [Cr(CN)_(6)]` is

Options

A. hexacynochromate (III) hexaamminecobalt (III)
B. hexaaamminecobalt (III)hexacyanidochromate (III)
C. hexaamminechrominum cobalt hexaammine (VI)
D. hexamminecobalt (III) hexacyanochomium (III)

Answer

B

Explanation

In the given ionic coordination compound, both positive and negative ions. Ionic species are written as two words with the cation first. The central metal atom is identified by name, followed by the formal oxidation number in Roman numerals in parenthese. If the complex is an anion, the ending-ate adds to the metla name or replacees any -ium, -en, -or-ese ending . Thus, we have cobaltate and nickelate, but chromate and tungstate (not chromiumate). For a few metals, the element: ferrate (iron), argentate (silver), cuprate (copper) and aurate (gold).