Give one example of each of the following:
A basic oxide which is insoluble in water.

Explanation

To find an example of a basic oxide that is insoluble in water, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Basic Oxides**: Basic oxides are compounds formed by the reaction of metals with oxygen. They typically react with acids to form salts and water.

2. **Identify Insoluble Oxides**: We need to find a basic oxide that does not dissolve in water. Many metal oxides are insoluble in water, especially those of transition metals.

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