Which of the following is a low grade brown coal that is soft with high moisture content?

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SSC MTS 2020 (Held On : 11 Oct 2021 Shift 1 ) Official Paper 13
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  1. Bituminous
  2. Anthracite
  3. Peat
  4. Lignite

Answer (Detailed Solution Below)

Option 4 : Lignite
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The correct answer is Lignite.

Key Points

  •  Lignite
    • Lignite coal, often known as brown coal, is the lowest grade of coal with the lowest carbon content.
    • It is mostly employed in energy generation due to its low heating value and high moisture content.
  • ​Bituminous
    • Bituminous coal is a coal that falls in between sub-bituminous and anthracite in terms of rank.
    • Bituminous coal has a high heating value (Btu) and is utilized in the United States for electricity generation and steel production.
    • When first encountering bituminous coal, it appears blocky and shiny, and smooth, but closer inspection reveals thin, alternating, shiny, and dull layers.
  •  Anthracite
    • The highest rank of coal.
    • It is a hard, brittle, black glossy coal with a high percentage of fixed carbon and a low percentage of volatile matter, sometimes referred to as hard coal.
  • ​Peat
    • ​Peat is a precursor of coal.
    • Peat is a soft, organic substance made up of partially decomposed plant and mineral materials.
    • Peat undergoes physical and chemical changes (coalification) to become coal when it is exposed to high pressure and heat.
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