Tag: mineral coal

Coal is mainly found in beds of sedimentary rocks. But metamorphic rocks might sometime contain anthracite coal. But sedimentary rocks is the most important source of coal.

Other than Carbon (the main constituent), all the above mentioned elements are also present in coal.

Coal is available in four forms: Lignite, bituminous, anthracite and sub- bituminous. Anthracite is the highest ranked coal with the carbon percentage of above 87%. The carbon conten in lignite is 60-70%.  Tamil nadu is the largest producer of lignite coal.

Coal is available in 4 forms: Lignite, bituminous, anthracite and sub-bituminous. Anthracite is the highest ranked coal with the carbon percentage of above 87%. The carbon content in bituminous is 77-87%, in sub-bituminous is 71-77% and in lignite is 60-70%.  Lignite has the least carbon content and hence highest ash content.

• Peat has the carbon content of about 
• Anthracite has the carbon content of above 87%.

Anthracite coal has several important advantages not only over other forms of coal but over other energy-producing materials in general. Its most important advantage is, of course, the fact that it produces very little pollution or soot, making it a very clean source of heat. Anthracite coal is also very efficient because only a small amount needs to be burnt to produce a large amount of energy. Additionally, there is a large supply of anthracite, over six billion tons in the Appalachian Mountains alone, with more reserves found in the Rocky Mountains and the Andes.

Hence, the correct option is $C$

• Peat has the carbon content of about 40%-55%
• Anthracite has the carbon content of above 87%.

Fly ash is also known as pulverised fuel ash. It is one of the coal combustion products. The pneumatic system is employed for the disposal of fly ash. 

The substance that burns in the presence of oxygen and heat are called combustible substances whereas that do not burn are non-combustible substances. Elements such as carbon, hydrogen and sulphur present in the fuel makes it combustible.

The ash content of Indian coal is 30℅. Initially, in the 1970s it was 28℅. The quality of Indian coal is deteriorating over the years. Compared to other constituents also, ash content is more in Indian coal.