When air is blown from mouth into a test-tube containing limewater, the limewater turned milky due to the presence of:
A
Oxygen
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B
Carbon dioxide
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C
Nitrogen
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D
Water vapour
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Solution
The correct option is B Carbon dioxide When limewater reacts with CO2, an insoluble precipitate of CaCO3 is formed. This turns limewater milky. This is a confirmatory test for the presence of carbon dioxide.