Question 11
When air is blown from the mouth into a test-tube containing limewater, the limewater turned milky due to the presence of

(a) oxygen
(b) carbon dioxide
(c) nitrogen
(d) water vapour

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Solution

(b) 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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Question 11 When air is blown from the mouth into a test-tube containing limewater, the limewater turned milky due to the presence of (a) oxygen (b) carbon dioxide (c) nitrogen (d) water vapour

Question 11
When air is blown from the mouth into a test-tube containing limewater, the limewater turned milky due to the presence of

(a) oxygen
(b) carbon dioxide
(c) nitrogen
(d) water vapour