Question

What percent of the carbon content is present in Bituminous coal?
A.$90 - 95\%$
B.$70 - 90\%$
C.$40 - 60\%$
D.$30 - 35\%$

Answer 1

Hint: Coal is a flammable black or brownish-black sedimentary rock that is found in the form of coal seams. Coal is mostly made up of carbon, with varying proportions of additional elements such as hydrogen, sulphur, oxygen, and nitrogen. Over millions of years, dead plant matter decays into peat, which is then transformed to coal by the heat and pressure of deep burial.

Complete answer: Bituminous coal, often known as black coal, is a soft coal that contains a tar-like material known as bitumen or asphalt. It has a better quality than lignite and subbituminous coal, but not as good as anthracite. High pressure is generally applied to lignite to cause formation. It can be black or dark brown in hue, with well-defined bands of brilliant and dull material running through the seams. Bituminous coals are stratigraphically characterised by these separate sequences, which are classed as "dull, brilliant-banded" or "bright, dull-banded." Bituminous coal has a moisture content of up to 17 percent. Nitrogen makes up from 0.5 to $2\%$ of the weight of bituminous coal. It has a fixed carbon content of up to 85 percent and ash content of up to 12 percent by weight. This sort of coal is recognised in the coal mining business for emitting the most firedamp, a deadly combination of gases that can trigger subterranean explosions. Bituminous coal extraction necessitates the most stringent safety standards, including constant gas monitoring, adequate ventilation, and careful site management.
Hence option B is correct.

Note:
Vitrinite reflectance, moisture content, volatile content, plasticity, and ash content are all used to grade bituminous coals. Plasticity, volatility, and low ash content are all characteristics of high-value bituminous coals, especially those with low carbonate, phosphorus, and sulphur content. Plasticity is important for cooking since it refers to the ability of coal to develop distinct plasticity phases over time, as assessed by coal dilatation experiments. Because phosphorus is a particularly harmful ingredient in steel production, these coals must have a low phosphorus level.