Cao can be used as a drying agent. one such application occurs when water is added to dry concrete or cement. the reaction that occurs is

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Answer:  CaO (s) + H₂O (l)  ↔  CaOH₂ (s) 
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The reaction that occurs when CaO can be used as a drying agent is  CaO (s) + H₂O (l)  ↔  CaOH₂ (s) .

What is drying agent?

A drying agent can also be referred to as desiccant and they are usually  hygroscopic substance that help to sustains dryness in its compound.

Using CaO as a drying agent, which is formed by the application of water to the calcium oxide and calcium hydroxide will be formed in the process.

Learn more about  drying agent at: https://brainly.com/question/25736513

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