Question

7 multiple choice 1 point cocl₃ cobalt chloride (iii) cobalt (iii) chloride cobalt chloride

Explanation:

When naming ionic compounds with transition metals (like cobalt), we use Roman numerals to indicate the oxidation state of the metal. The formula \(CoCl_3\) has cobalt (\(Co\)) with an oxidation state of \(+ 3\) (since each \(Cl^-\) has a charge of \(-1\) and there are three \(Cl^-\) ions, so \(x+3\times(- 1)=0\), \(x = + 3\)). The naming convention is \(\text{Metal (Oxidation State)} \text{ Non - metal}\) (with the non - metal ending in - ide). Here, the non - metal is chloride.

Answer:

B. Cobalt (III) Chloride