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The gas that turns lime water milky is?
A. Oxygen
B. Carbon dioxide
C. Hydrogen
D. Nitrogen
Correct Answer Is Option = Carbon dioxide
Notes / Explanation
The gas that turns lime water milky is carbon dioxide, and this is a well-known test used in chemistry to detect the presence of carbon dioxide. Lime water is a clear, colourless solution made by dissolving a certain substance in water, and it has the useful property that when carbon dioxide gas is passed through it or comes into contact with it, the lime water turns cloudy or milky, losing its clearness and taking on a milky white appearance. This happens because the carbon dioxide reacts with the substance dissolved in the lime water to form a new substance that is not dissolved but forms tiny solid particles suspended in the water, giving it the cloudy, milky appearance. Because this change happens specifically with carbon dioxide, the turning of lime water milky is used as a test for the presence of carbon dioxide: if a gas turns lime water milky, this shows that the gas contains carbon dioxide. This test is commonly used in the study of chemistry to identify carbon dioxide. Carbon dioxide is a gas that is produced in a number of common processes, including the breathing out of air by people and animals, since the air breathed out contains more carbon dioxide than the air breathed in, and the burning of substances that contain carbon, such as wood, coal, oil and gas. The test with lime water can be used to show, for example, that the air breathed out contains carbon dioxide, by breathing out through lime water and observing it turn milky. Carbon dioxide is an important gas in nature, being taken in by plants in the making of their food and given out by living things in breathing, and being one of the gases involved in the warming of the atmosphere. The study of gases and the tests used to identify them is a part of the science of chemistry. For PPSC and other competitive examinations, the key points to remember are that the gas that turns lime water milky is carbon dioxide, that lime water is a clear solution that turns cloudy or milky when carbon dioxide comes into contact with it, that this happens because the carbon dioxide reacts to form tiny solid particles suspended in the water, and that the turning of lime water milky is used as a test to detect the presence of carbon dioxide.
