Name the chemical used to test the presence of CO2 in exhaled air. [1 MARK] &#

Question

Name the chemical used to test the presence of $C O_{2}$ in exhaled air. [1 MARK]

Options:

Answer: Option A
:

Calcium hydroxide (chemical name for limewater) reacts with carbon dioxide in the exhaled air to form calcium carbonate which is insoluble in water and thus forms a milky white precipitate.

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