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

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

(a) oxygen 

(b) carbon dioxide 

(c) nitrogen 

(d) water vapour

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1 Answer

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The answer is (b) carbon dioxide

Carbon dioxide reacts with lime water to convert it to milky.

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