Biology
Lime water turns milky upon absorption of carbon dioxide gas due to the formation of:
- Calcium carbonate
- Sodium carbonate
- Calcium chloride
- Sodium chloride
Answer
Calcium carbonate
Reason — When carbon dioxide is passed through limewater (calcium hydroxide), it reacts to form calcium carbonate, a white precipitate that makes the solution turn milky.
Sodium carbonate is not formed in this reaction because limewater contains calcium, not sodium. Calcium chloride is formed in reactions involving hydrochloric acid, not carbon dioxide. Sodium chloride is unrelated to this reaction.
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