Answer in detail I — task. Science State Board, Class 8.

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Explain the different types of coal.

Coal is classified into four categories based on the amount of carbon it contains and its heat-producing ability .

Answer variants:

Peat

Lignite

Sub-bituminous

Anthracite

Bituminous

Low-grade brown coal. It has the least amount of carbon (\(25\) to \(35\)). It is utilised to generate energy, synthesise natural gas and make fertilizer.
When lignite becomes darker and harder over time, this coal is formed. This coal is black and dull coal. It includes \(35-44\) carbon. It is mostly used to generate electricity. This type of coal has a lower sulphur content and burns cleaner than others.
Sub-bituminous coal becomes this coal as it undergoes additional chemical and physical changes. This is dark and hard. It has a carbon content of \(45–86\).
Best quality coal. It has a low weight and maximum heat content. This is hard, deep black and shiny. It has a carbon content of \(86–97\).

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9. Answer in detail I