ESS
Grade-8
Easy
Question
Which of the following characteristics measure the quality of coal?
- Amount of carbon
- Amount of oxygen
- Blackness of coal
- Hardness of coal
Hint:
Amount of carbon
The correct answer is: Amount of carbon
The ranking depends on the types and amounts of carbon the coal contains and on the amount of heat energy the coal can produce. Anthracite contains 86%–97% carbon and generally has the highest heating value of all ranks of coal. Lignite contains 25%–35% carbon and has the lowest energy content of all coal ranks.
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