4.
Limewater turns milky when CO,
is passed through it
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Calcium hydroxide is sparingly soluble in water producing an alkaline solution known as limewater. When carbon dioxide gas is passed through or over limewater, it turns milky due to the formation of calcium carbonate. Lime reacts with acidic gases like sulfur dioxide.
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Answer:
When carbon dioxide gas is passed through limewater it turns milky.
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