Question

11.) $\text{ba(oh)}_2$ (1 point)$\bigcirc$ barium hydroxide$\bigcirc$ barium (ii) hydroxide$\bigcirc$ barium oxygen hydride$\bigcirc$ barium (ii) hydroxide

Explanation:

Ba is barium, which is a group 2 metal that only forms a +2 ion. The polyatomic ion here is hydroxide ($\text{OH}^-$). For group 1 and 2 metals with only one common oxidation state, we do not need to include the Roman numeral in the name. The correct name combines the cation name with the polyatomic anion name.

Answer:

A. Barium Hydroxide