Question

Which of the following statements regarding coal is accurate?

1. Coal primarily consists of water and decomposed organic matter hardened over millions of years
2. Lignite is the hardest coal variant with the highest energy output
3. Bituminous coal releases the lowest amount of sulphur dioxide upon combustion

• A. ii, iii
• B. None of these
• C. i only
• D. i, ii

Answer 1

Answer:

C. i only

Coal formation

• Coal formation begins with the decomposition of organic material, such as trees and plants, which undergoes a transformation over millions of years due to pressure and heat.
• This process results in the creation of coal, which is known as the most abundant fossil fuel.
• The carbonaceous organic matter first evolves into peat, a precursor to coal, consisting primarily of water.
• With increased pressure and temperature, this peat undergoes a chemical transformation into coal, resulting in a carbon-rich material that can be used as an energy source.

Lignite

• Lignite, often referred to as brown coal, represents the softest form of coal.
• It typically contains a lower carbon content of around 50%, leading to a relatively lower energy output compared to other coal types.
• Due to its lower energy efficiency, lignite is not as commonly used as other coal varieties, but it still serves as a significant energy source in some regions.

Bituminous coal

• Bituminous coal, also known as soft coal, contains a higher carbon content of approximately 85%, making it a more efficient energy source compared to lignite.
• However, one significant environmental concern associated with the burning of bituminous coal is the release of sulfur dioxide, a harmful pollutant that can contribute to air pollution and have adverse effects on human health and the environment