Question

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Answer 1

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★ Properties of Coal :-

→ Coal was formed in wide, low-lying equatorial swamps crossed by large rivers and covered by forests of primitive trees.

→ Here, the remains of trees and plants were saved from biodegration and oxidation by mud and water.

→ Coal is usually black in colour but sometimes it occurs as a brownish-black colour.

→ There are four broad ranks or types of coal depending upon its age.

→ Commencing with the youngest and lowest carbon content, these are: lignite, sub-bituminous, bituminous and anthracite.

→ Coal is primarily composed of carbon, along with a range of other elements, particularly sulphur. It has been estimated that a coal seam 1 foot thick needed as much as 7 to 10 feet of peat thickness to commence with.

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Answer 2

Explanation:

Other properties, such as hardness, grindability, ash-fusion temperature, and free-swelling index (a visual measurement of the amount of swelling that occurs when a coal sample is heated in a covered crucible), may affect coal mining and preparation, as well as the way in which a coal is used