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Question

Is $$CaO$$ an alkali or a base?

Solution
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$$CaO$$ is a basic oxide, as it follows the general rule that Metal oxides are basic, non-metal oxides are acidic.

Now, we need to check if it's soluble or not as if it is soluble, it's considered an alkali, but if it's insoluble, it is a base.

$$CaO$$ is slightly soluble, so it is considered to be alkali.

Calcium oxide $$(CaO)$$, commonly known as quicklime or burnt lime, is a widely used chemical compound. It is a white, caustic, alkaline, crystalline solid at room temperature.

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Is $$CaO$$ an alkali or a base?
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Potassium hydroxide in an aqueous solution gives the following equation:

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