Chemistry
Grade-8
Easy
Question
Read the following paragraph carefully.
The huge forest grows around 300 million years ago covering most of the portion of the earth. Due to the extreme pressure of the earth and high temperature, and the absence of air, the vegetation dies and forms X . This X is compressed between sediment layers to form Y. Further compression forms Z and W, eventually anthracites are formed.
Identify the compounds W, X, Y and Z in the above paragraph:
Hint:
The coal formed first has low carbon contents. Anthracite has the highest coal concentration.
The correct answer is:
The correct option is c)
Peat is the first, type of coal formed . It has the lowest carbon content.
Lignite, also called brown coal , is the coal with the lowest carbon concentration 60-70% carbon content.
Bituminous coal is a type of coal that contains a tar-like substance called bitumen or asphalt. It has 60-80% carbon content.
Bituminous coal contains 42-52% carbon (on a dry, ashless basis) and has a calorific value in the range of approximately 19-26 megajoules per kilogram.
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