Question

Write a very short note on coal (short note please)

Answer 1

Coal is a hard rock which can be burned as a solid fossil fuel. It is mostly carbon but also contains hydrogen, sulphur, oxygen and nitrogen. It is a sedimentary rock formed from peat, by the pressure of rocks laid down later on top.

Answer 2

$\huge\sf{\underline{\underline{Coal:}}}$

$\bullet$ It is the crude form of carbon.

$\bullet$ It has been formed in nature as a result of slow decomposition of vegetables matter under the influence of heat, pressure and limited supply of air.

$\bullet$ The successive stages of transformation are: peat, lignite, bituminous, steam coal and anthracite.

$\bullet$ Bituminous is hard stone, burns with smoky flame. The superior quality is anthracite which burns with non-smoky flame.

$\bullet$ Lamp black or carbon black: It is obtained by burning substances rich in carbon content such as kerosene, petroleum, turpentine oil, acetylene etc. in a limited supply of air.