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प्रश्न
Lime water turns milky when ______ gas is passed through it.
विकल्प
H2
CO
CO2
SO2
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उत्तर
Lime water turns milky when CO2 gas is passed through it.
Explanation:
This is because carbon dioxide reacts with calcium hydroxide in lime water to form insoluble calcium carbonate, which appears as a milky white precipitate.
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