Final answer:
Among the given compounds, calcium oxide is soluble and basic, phosphorus pentoxide is acidic, and copper(II) sulfate (incorrectly listed as insoluble in the options) is actually soluble in water and is neither acidic nor basic.
Step-by-step explanation:
When considering the properties of calcium oxide (CaO), phosphorus pentoxide (P4O10), and copper(II) sulfate (CuSO4), we need to look at their solubility in water and whether they are acidic or basic. Calcium oxide is considered slightly soluble in water, and when it does dissolve, it forms a basic solution due to it being a metal oxide. Phosphorus pentoxide is an oxide of a nonmetal and is acidic; it reacts with water to form phosphoric acid (H3PO4). Copper(II) sulfate, which is often just called copper sulfate, is highly soluble in water, but it is neither acidic nor basic; it is a salt formed from the neutralization of sulfuric acid and copper(II) oxide.
Therefore, the option that correctly identifies the properties of each compound is C) Calcium oxide: Soluble, Phosphorus pentoxide: Acidic, Copper two sulfate: Insoluble. However, the classification of copper(II) sulfate as insoluble is incorrect according to general solubility rules, as most sulfate salts are soluble. Thus, we must select option C) with the clarification that copper(II) sulfate is in fact soluble, not insoluble, in water.