Carbon and Fossil Fuels

All of the above are the achievements of green chemistry.

During the burning of fuels, carbon and hydrogen present in the fuels are released into the atmosphere in the form of carbon oxides and water vapors.

Burning of candle wick is chemical change and melting of wax is physical change.

ATF is a common acronym used for both Automatic Transmission Fluid in the automotive industry and Aviation Turbine Fuel in the aerospace industry. Both are specialized fluids designed for specific mechanical and thermal requirements. Therefore, option D is the most comprehensive answer.

Lac is a resinous secretion from the lac insect, and natural wax (like beeswax) is produced by honeybees. Both are biological products derived from insect activity.

Anthracite is the highest grade of coal, characterized by a high carbon content (often exceeding 85-90%) and low impurities. Bituminous coal has a lower carbon content, followed by lignite and then peat, which is the lowest grade. Higher carbon content results in a higher energy density and less smoke during combustion.

Liquefied Petroleum Gas (LPG) is a mixture of flammable hydrocarbon gases. Its primary components are propane and butane, though it may also contain small amounts of propylene and butylene.

Anthracite is a hard, compact variety of mineral coal that has a high luster. It has the highest carbon count, the fewest impurities, the highest calorific content of all types of coals, which also include bituminous coal and lignite.

Methane (CH4) is commonly known as marsh gas because it is produced by the anaerobic bacterial decomposition of vegetable matter in swampy or marshy areas. It is the simplest alkane and the main component of natural gas. Other gases like butane and propane are found in LPG but are not called marsh gas.

One should not sleep in a closed room where a charcoal fire is burning as it produces CO. The produced CO will combine with the Hemoglobin present in the blood, which cause death of a person.

Butane is a highly flammable hydrocarbon gas that is easily liquefied under pressure, making it ideal for use in cigarette lighters.

Liquefied Petroleum Gas or LPG (also called Autogas) consists mainly of propane, propylene, butane, and butylene in various mixtures. It is produced as a by-product of natural gas processing and petroleum refining. The components of LPG are gases at normal temperatures and pressures. One challenge with LPG is that it can vary widely in composition, leading to variable engine performance and cold starting performance. At normal temperatures and pressures, LPG will evaporate. Because of this, LPG is stored in pressurized steel bottles. Unlike natural gas, LPG is heavier than air, and thus will flow along floors and tend to settle in low spots, such as basements. Such accumulations can cause explosion hazards, and are the reason that LPG fuelled vehicles are prohibited from indoor parkades in many jurisdictions.

Anthracite is the highest rank of coal, containing the highest carbon content and the lowest moisture content, which makes it burn cleaner and hotter.

Primary fuels are found in nature (like coal, wood, and natural gas). Kerosene is a refined petroleum product, making it a secondary fuel.