Question

Arrange the following coal types in the increasing order of their heat content (KJ/kg)
(A). Peat
(B). Lignite
(C). Anthracite
(D). Bituminous
(E) Sub-bituminous
Choose the correct answer from the options given below:

• A. (A), (B), (C), (D), (E)
• B. (A), (B), (E), (D), (C)
• C. (C), (D), (E), (B), (A)
• D. (A), (B), (D), (E), (C)

Hint:

Remember the acronym \textbf{PLBAS} (for \textbf{P}eat, \textbf{L}ignite, \textbf{B}ituminous, \textbf{A}nthracite, \textbf{S}ub-bituminous is between L and B). The order in the acronym is from lowest quality (heat content) to highest, with Sub-bituminous fitting between Lignite and Bituminous.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Coal's heat content is directly proportional to its rank (stage of formation). Increased heat and pressure during coalification result in higher carbon and heat content. The question requires ordering from lowest to highest heat content.

Step 2: Detailed Explanation:
Coal ranks, from lowest to highest heat content, are:
1. (A) Peat: The coal precursor. It has low carbon, high moisture, and the lowest heat content.
2. (B) Lignite: Brown coal; the lowest rank of coal. It has a higher heat content than peat.
3. (E) Sub-bituminous: Ranks above lignite, with lower moisture and higher carbon content.
4. (D) Bituminous: Dense, black coal with high heat content; the most abundant type.
5. (C) Anthracite: The highest rank of coal. It possesses the highest carbon content, lowest moisture, and highest heat content.

Step 3: Final Answer:
The increasing order of heat content is Peat < Lignite < Sub-bituminous < Bituminous < Anthracite. This sequence corresponds to (A), (B), (E), (D), (C).