Air blown into limewater, turns it milky. This confirms the presence of in air.

carbon dioxide

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water

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calcium oxide

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Solution

The correct option is A carbon dioxide
When air is blown into limewater, the solution turns milky. This confirms the presence of carbon dioxide $(C O_{2})$ in air. This is because $C O_{2}$ reacts with limewater $(C a (O H)_{2})$ and forms insoluble calcium carbonate ${(CaCO)}_{3}$ which is 'white' in colour.

The suspended particles of white calcium carbonate settle down after some time.
The chemical reaction involved is:
${Ca(OH)}_{2} (a q) + {CO}_{2} (g) \to {CaCO}_{3} (s) + H_{2} O (l)$

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