Question

when we exhale air into a glass containing lime water turns milky mention the reason behind it ?​

Answer 1

Answer:

the air we exhale contains carbon dioxide .

if carbon dioxide passed through limewater then a milky solution due to precipitation of the insoluble suspension of calcium carbonate is formed

here is the chemical equation

Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O.

Answer 2

Answer:

Ca(OH)2 + CO2 => CaCO3 + H2O