Air is exhaled through lime water and air is passed through lime water using pichkari. In which case lime water turns milky first? Give reason.

Lime water will turn milky first when air is exhaled through lime water because exhaled air contains a greater concentration of carbon dioxide than present in air. 

Explanation:

Limewater is the common name for saturated calcium hydroxide solution.

Its chemical formula is Ca(OH)2.

When CO2 is passed through lime water, it turns milky due to the formation of calcium carbonate. This reaction can be denoted as:

Ca (OH) 2 + CO2 → CaCO3 + H2O

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