Explanation

A. Salt: Salt, typically in the form of sodium chloride (NaCl), is commonly used to melt ice on roads during winter in cold countries. When salt is spread on icy roads, it lowers the freezing point of water, causing the ice to melt and preventing further ice formation. This process is known as freezing point depression. B. Chlorine: Chlorine is not typically used to melt ice on roads. Chlorine is a chemical element often used for disinfection purposes in water treatment, swimming pools, and as a bleach. While it has certain industrial applications, it is not commonly used for de-icing roads. C. Carbon dioxide: Carbon dioxide (CO2) is a colorless gas that does not directly melt ice. However, carbon dioxide can indirectly contribute to the melting of ice through processes such as dry ice blasting. Dry ice, which is solid carbon dioxide, can be used to remove ice by rapidly sublimating (turning from solid directly to gas), creating a cooling effect that can cause ice to loosen and break away. D. Water: Water itself is not typically used to melt ice on roads during winter. Water would freeze at cold temperatures, making the situation worse rather than melting the ice. However, water can be used in combination with other substances like salt to create brine solutions, which are sprayed or spread on icy roads to accelerate the melting process. In summary, while salt is the most commonly used substance to melt ice on icy roads during winter, the other options have different applications and are not typically used for this purpose. while salt is the most commonly used substance to melt ice on icy roads during winter, the other options have different applications and are not typically used for this purpose.