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Q.

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

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a

 oxygen 

b

nitrogen 

c

carbon dioxide

d

 water vapour

answer is B.

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Detailed Solution

Carbon dioxide reacts with lime water and turns it milky white in colour due to the formation of Calcium carbonate.This experiment shows the presence of carbon dioxide.

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