Viscous black liquid produced in the destructive distillation of coal to make coke & gas is known as coal tar. Coal tar is a byproduct of the process of heating coal to high temperatures in the absence of air. This process, known as destructive distillation, breaks down the organic compounds in coal into various products, including coke, gas, and coal tar.

Coal tar is a thick, viscous liquid that is black in color and has a strong, pungent odor. It is commonly used in the production of a variety of products, including roofing materials, sealants, and pavement sealers. Coal tar is also used in the medical field as a treatment for certain skin conditions, such as psoriasis and eczema.

One of the key properties of coal tar is its high carbon content, which makes it an excellent source of fuel. When burned, coal tar produces a high amount of heat energy, making it an efficient fuel source for various industrial processes. In addition to its use as a fuel, coal tar is also used in the production of chemicals, such as creosote and naphthalene.

From an environmental perspective, the production and use of coal tar can have negative impacts. The process of destructive distillation releases harmful pollutants into the air, including volatile organic compounds (VOCs) and polycyclic aromatic hydrocarbons (PAHs). These pollutants can contribute to air pollution and have been linked to various health issues, including respiratory problems and cancer.

Overall, coal tar is a valuable byproduct of the destructive distillation of coal, with a wide range of industrial applications. However, its production and use raise concerns about environmental and health impacts. As industries continue to seek alternative, more sustainable sources of fuel and chemicals, the use of coal tar may decrease in favor of cleaner, more environmentally friendly options.

In conclusion, coal tar is a viscous black liquid produced in the destructive distillation of coal to make coke & gas. Despite its usefulness in various industries, its production and use come with environmental and health concerns that need to be addressed.

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