Question

Coal is a substance mainly containing carbon also having oxygen, hydrogen, nitrogen and
(A) Sodium
(B) Sulphur
(C) Aluminium
(D) Chlorine

Answer 1

Coal is a very popular substance made of pure carbon. Carbons are linked to each other with a covalent bond. It is mainly made from the dead plant matters which are submerged in the ground for hundreds of millions of years. Due to the pressure on the matter and the moisture, the dead plant matters transform into coal. Many other substances are included with carbon in the coal.

Complete step by step answer:
Coal is a kind of sedimentary rock which includes in it a high amount of hydrocarbons or carbon. Mainly coal is classified into four types according to the amount and quality of carbon contained in it and the kind of heat energy it can produce. The four types are anthracite, bituminous, sub-bituminous, lignite.
Anthracite: It is a type of coal which mainly contains $86\%$ to $97\%$ of carbon in it, it is the highest valued coal and anthracites are mainly used in the metal industries.
Bituminous: It is a type of coal which mainly contains $45\%$ to $86\%$ carbon. It is mainly used to generate electricity. It is used very importantly in the fuel and raw material for making coking coal. It can also be used in the iron and steel industry.
Subbituminous: It is a type of coal, which mainly contains $35\%$ to $45\%$ of carbon.
Lignite: It is a type of coal which mainly contains $25\%$ to $35\%$ of carbon.
Coal is a substance mainly containing carbon and also having oxygen, hydrogen, nitrogen and sulphur in it.
Correct option is B.

Note:
Peat is also a type of coal which has the least amount of carbon contained in it. It has softness, it is crumbly, it is dark brown in colour. It is a kind of a non-renewable energy source. It is mainly used as an energy source for cooking, electricity, etc.