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| Q. |
If lime water is kept in the air, it turns milky due to presence of – |
| A. | Carbondioxide |
| B. | Nitrogen |
| C. | Oxygen |
| D. | Sulphurdioxide |
| Answer» A. Carbondioxide | |
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Explanation: Lime water is calcium hydroxide (Ca(OH)2). When carbon dioxide is passed into it, it turns milky because of the formation of calcium carbonate: Ca(OH)2 + CO2 = CaCO3 +H2O |
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