Question

What is the correct sequence of coal types from lowest to highest carbon content?

• A. Lignite $\rightarrow$ Peat $\rightarrow$ Bituminous $\rightarrow$ Anthracite
• B. Peat $\rightarrow$ Lignite $\rightarrow$ Bituminous $\rightarrow$ Anthracite
• C. Peat $\rightarrow$ Bituminous $\rightarrow$ Lignite $\rightarrow$ Anthracite
• D. Lignite $\rightarrow$ Bituminous $\rightarrow$ Peat $\rightarrow$ Anthracite

Hint:

A simple way to remember the sequence of coal types: \textbf{Peat $\rightarrow$ Lignite $\rightarrow$ Bituminous $\rightarrow$ Anthracite} You can remember it using the mnemonic: \textbf{``Please Learn Basic Analysis''} (Peat, Lignite, Bituminous, Anthracite) Carbon content and heating value increase in this order.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Coal is a fossil fuel formed from the remains of ancient plant life that underwent heat and pressure over millions of years (a process called coalification).
The quality and rank of coal are determined by its carbon content, which increases over time with greater heat and pressure.
Step 2: Detailed Explanation:
1. Peat: The first stage of coal formation. It has the lowest carbon content (less than 60%) and a high moisture content.
2. Lignite: Often called brown coal, it has a slightly higher carbon content (about 60-70%) and is mainly used for electricity generation.
3. Bituminous: A soft, black coal with a carbon content of around 70-86%. It is widely used in power generation and steel making.
4. Anthracite: The highest rank of coal. It is a hard, glossy black coal with the highest carbon content (86-97%) and the lowest moisture content.
Therefore, the correct sequential order from lowest to highest carbon content is Peat, Lignite, Bituminous, and Anthracite.
Step 3: Final Answer:
The correct sequence is Peat \(\rightarrow\) Lignite \(\rightarrow\) Bituminous \(\rightarrow\) Anthracite.