Chemistry
Grade-8
Easy
Question
Write the descending order of different forms of coals based on the percentage of carbon present in it.
- Bituminous coal > Anthracite > Peat > Lignite
- Anthracite > Bituminous coal > Peat > Lignite
- Anthracite > Bituminous coal > Lignite > Peat
- Bituminous coal > Anthracite > Lignite > Peat
Hint:
The ones formed first have the lowest carbon content.
The correct answer is: Anthracite > Bituminous coal > Lignite > Peat
The correct option is c)Anthracite > Bituminous coal > Lignite > Peat.
Anthracite contains 86-97% candy and generally has the highest calorific value of all chars. Hard coal contains 45% to 86% carbon. Lignite contains 25-35% bone and has the lowest energy content of all coals. Lignite deposits are usually relatively young and have not been subjected to extreme heat or pressure. Peat is the first stage of wood-to-charcoal conversion and contains less than 35% carbon, sufficient volatiles, and high moisture content. Its heat output is low and it is usually used as domestic fuel.
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