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Solution


Q.

When air is blown from mouth into a test tube containing lime water, the lime water turns milky due to the presence of :
1 Oxygen  
2 Nitrogen  
3 Carbon dioxide  
4 Water vapour  

Ans.

(3)

Calcium hydroxide solution is the lime water. When it reacts with carbon dioxide, it forms insoluble calcium carbonate, which remains suspended in water and gives it a milky white colour.