When air is blown from mouth into a test tube containing lime water, the lime water turns milky due to the presence of:
As we know that when the exhaled air rich in carbon dioxide is blown from mouth into test tube. The lime water turns milky on passing CO₂ gas into it due to formation of insoluble calcium carbonate (CaCO3). As it reacts with lime water (calcium hydroxide – Ca(OH)₂) to produce calcium carbonate and water.
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[B] Carbon dioxide
As we know that when the exhaled air rich in carbon dioxide is blown from mouth into test tube. The lime water turns milky on passing CO₂ gas into it due to formation of insoluble calcium carbonate (CaCO3). As it reacts with lime water (calcium hydroxide – Ca(OH)₂) to produce calcium carbonate and water.