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Turning lime water milky is a strong experimental indication for which gas?

Answer and explanation

Correct answer: Carbon dioxide

Carbon dioxide turns lime water milky because it reacts with aqueous calcium hydroxide to form insoluble calcium carbonate: CO₂ + Ca(OH)₂ → CaCO₃↓ + H₂O. The suspended calcium carbonate particles produce the milky appearance. Hydrogen, oxygen, and nitrogen do not normally give this characteristic limewater test, so they cannot explain the observed precipitate.

Related tags

ScienceClass10Chemical-ReactionsLimewaterCarbon-Dioxide-TestChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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