The hardest form of coal is:
Correct answer: C. Anthracite
- A. Bituminous
- B. Sub-bituminous coal
- C. Anthracite
- D. Lignite
Explanation
Coal is classified into four main types based on its carbon content, heating value, and other properties. These types, from lowest to highest carbon content, are lignite, sub-bituminous coal, bituminous coal, and anthracite.
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About Fundamental Principles of Organic Chemistry
Organic chemistry begins with carbon compounds classified by carbon skeleton, saturation and functional group. Work includes identifying groups such as hydroxyl, carbonyl, carboxyl and amino, applying basic nomenclature, and distinguishing structural, geometric and optical isomers, where the same molecular formula does not necessarily mean the same structure or properties.
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