Question

Arrange the following coal types in decreasing order of their oxygen, hydrogen and moisture contents: A. Lignite B. Peat C. Bituminous D. Anthracite

• A. B, A, C, D
• B. A, B, C, D
• C. D, C, A, B
• D. D, C, B, A

Hint:

Higher coal rank = more carbon, less O/H/moisture. Anthracite has the least O/H/moisture; Peat has the most.

Answer 1

The Correct Option is A

Step 1: Concept
Coal classification and its chemical composition trends.

Step 2: Meaning
As coal rank increases (Peat $\rightarrow$ Lignite $\rightarrow$ Bituminous $\rightarrow$ Anthracite), carbon content increases while oxygen, hydrogen, and moisture contents decrease.

Step 3: Analysis
In decreasing order of O, H, and moisture content:
Peat (B, highest O/H/moisture) $>$ Lignite (A) $>$ Bituminous (C) $>$ Anthracite (D, lowest).

Step 4: Conclusion
Decreasing order of oxygen, hydrogen, and moisture: B, A, C, D. Final Answer: (A)