Question

Coke is produced from bituminous coal by:
A. Cracking
B. Synthesis
C. Substitution
D. Destructive distillation
E. None of the above.

Answer 1

Hint: Coke is a pure form of carbon obtained from bituminous coal. Coke is a black color substance and porous in nature. Bituminous coal contains 45 - 86 percent of carbon in it and the remaining percentage contains water, air, sulphur and hydrogen.

Complete Solution :
- In the question it is asked that coke is going to produce from bituminous coal by which process among the given options.
- Under inert conditions the bituminous coal is heated at higher temperature to get the coke.
- The process of heating nothing but pyrolysis to get coke from bituminous coal is called destructive distillation.
- The destructive distillation creates cracks in the bituminous coal (larger molecules).
- Destructive distillation is used to process some organic compounds with minimum amounts of oxygen, solvents and catalysts like steam and phenol.
- In destructive distillation of bituminous coal we will get a lot of different products other than coke.
 - Therefore by using a destructive distillation process we can get coke from bituminous coal.
So, the correct answer is “Option D”.

Note: Destruction distillation is supposed to carry out in the absence of air in an airtight jar. The temperature maintained in this process is in between 450 – 500 $^{o}C$ . A ton of bituminous coal produces 700 kg of coke after destructive distillation, hundred liters of liquid ammonia, 50 litres of coal tar and 400 cubic meter of coal gas as the products.