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Question

(C) When we exhale,the air we breathe out contains a higher concentration of $CO_2$ compared to the air we inhale.Lime water is a solution of calcium

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carbon dioxide

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(C) When we exhale,the air we breathe out contains a higher concentration of $CO_2$ compared to the air we inhale.Lime water is a solution of calcium hydroxide,$Ca(OH)_2$.When $CO_2$ is passed through lime water,it reacts to form calcium carbonate $(CaCO_3)$,which is insoluble in water and forms a white precipitate.This reaction is represented as: $Ca(OH)_2(aq) + CO_2(g) \rightarrow CaCO_3(s) + H_2O(l)$.The formation of this white precipitate of calcium carbonate makes the lime water appear milky.

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

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