Question

Coal mainly contains ________.
A.Hydrogen
B.Oxygen
C.Carbon
D.Sodium

Answer 1

Hint: We have to remember that the coal is a flammable dark or caramel dark sedimentary stone, shaped as rock layers called coal seams. Coal is framed when dead plant matter rots into peat and is changed over into coal by the warmth and weight of profound entombment more than a large number of years.

Complete answer:
We must know that the biggest purchaser and merchant of coal is China. China mines practically a large portion of the world's coal, trailed by India with about a 10th. Australia represents about 33% of world coal sends out followed by Indonesia and Russia.
The extraction and utilization of coal causes numerous unexpected losses and much illness. The coal business harms the climate, including by environmental change as it is the biggest anthropogenic wellspring of carbon dioxide, fourteen gigatons (Gt) in $2016$, which is $40\% $ of the absolute petroleum product emissions and practically $25\% $ of all out worldwide ozone depleting substance outflows.
We must know that the coal is generally carbon with variable measures of different components; mostly hydrogen, sulfur, oxygen, and nitrogen. Coal is essentially utilized as a fuel. While coal has been known and utilized for a great many years, its use was restricted preceding the Industrial Revolution.
Therefore, the option (C) is correct.
Finely ground bituminous coal, referred to in this application as ocean coal, is a constituent of foundry sand. While the liquid metal is in the shape, the coal consumes gradually, delivering diminishing gases at pressure, thus keeping the metal from entering the pores of the sand.

Note:
We must remember that the coal is made out of macerals, minerals and water. The change of dead vegetation into coal is known as coalification. At different occasions in the geologic past, the Earth had thick timberlands in low-lying wetland areas.