Yes, you are correct. The solubility of metal oxides in water is influenced by their pH or basicity. Oxides that are more basic tend to be more soluble in water, while oxides with lower basicity are generally insoluble.

When metal oxides dissolve in water, they can react with water molecules to form hydroxide ions (OH-) through a process called hydrolysis. This hydrolysis reaction occurs more readily for metal oxides that are more basic. The resulting hydroxide ions make the solution alkaline.

For example, alkaline earth metal oxides, such as calcium oxide (CaO) and magnesium oxide (MgO), are more basic and readily react with water to form hydroxides (calcium hydroxide and magnesium hydroxide, respectively), which are relatively soluble in water.

On the other hand, oxides of transition metals and some other metals are less basic and have limited solubility in water. They may not undergo significant hydrolysis, and as a result, they are generally insoluble or only slightly soluble in water.

In summary, the solubility of metal oxides in water is related to their pH or basicity. More basic oxides tend to dissolve more readily and form alkaline solutions, while less basic oxides are often insoluble in water.
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