Question

Properties of one of the mineral coal is given below. Identify the mineral coal.
$(1)$ It is a mixed form of mineral coal.
$(2)$ It contains $94\% $ to $98\% $ carbon.
$(3)$ Its heat energy is about $33KJgra{m^{ - 1}}$
A. Bituminous coal
B. Lignite
C. Peat
D. Anthracite

Answer 1

Hint: We know that coals are solid fossil fuels. The main contents of coal are carbon, hydrogen ,nitrogen, sulphur and oxygen. Coals can be further divided into four main types. They are bituminous coals, lignite coals, anthracite coals and sub bituminous coals.

Complete step by step answer:
It is very important for us to understand the different characteristics of the different types of coals.
Bituminous coals are soft coals. They are of higher quality than Lignite and subbituminous coals but of poorer quality than anthracite coals. Bituminous coals are formed when lignite coal undergoes pressure. Bituminous coals are also known as black coals .
Lignite coals are soft coals. They are brown in colour. It has a carbon content of $25\% - 35\% $ .It is considered as the lowest grade of carbon because it produces very less heat when burnt.
Peat are soft coals. They are the initial form of coal formation. They are of dark brown colour. When peat coals are given pressure and temperature they transform to lignite coals.
Anthracite coals best coals. They have a high carbon content of $94\% - 98\% $. Anthracite coals are very hard in nature. They have a natural lustre. The heat energy is about $33KJgra{m^{ - 1}}$. It is a mixed form of mineral coal.

Hence option D. Anthracite. is correct.

Note:
Anthracite have the highest energy density among all the coals present. Coals are black, brown coloured sedimentary rocks. Anthracite coals produce smokeless flames.Anthracite coals have the highest carbon content. They also have the highest energy density. Coals are the sedimentary rocks which are formed from the dead remains of the plants and trees. Coals are a type of fossil fuel.