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Question

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


Solution

option,b 
carbon dioxide

We inhale oxygen and exhale carbon dioxide.
When lime water ca(oh)2 react with CO2 it became milky.
When we release CO2 in lime water it became miky..


 Carbon dioxide [Carbon dioxide reacts with limewater to form calcium carbonate. Insoluble calcium carbonate is responsible for appearance of white colour.]

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