When air is blown from the mouth into a test-tube containing limewater, the limewater turned milky due to the presence of

oxygen

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carbon dioxide

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nitrogen

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water vapour

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Solution

The correct option is B carbon dioxide

When air is blown from the mouth into a test-tube containing limewater, the limewater turned milky due to the presence of carbon dioxide.

Calcium hydroxide is commonly known as lime water $(C a (O H)_{2})$ . When it reacts with $C O_{2}$ ,insoluble $C a C O_{3}$ is formed which turns the solution milky. When an excess of $C O_{2}$ is added, $C a C O_{3}$ reacts with water and $C O_{2}$ to form Calcium bicarbonate which is soluble. That is why the solution clears out.

Equations:

1) $C a (O H)_{2} + C O_{2} \to C a C O_{3} + H_{2} O$
2) $C a C O_{3} + C O_{2} + H_{2} O \to C a (H C O_{3})_{2}$

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