250+ TOP MCQs on Natural Products – Coal Industry and Answers

Chemical Process Technology Multiple Choice Questions on “Natural Products – Coal Industry”.

1. Coal is a hydrogen rich hydrocarbon. Is the statement true/false?
a) True
b) False

Answer: b
Clarification: The statement is wrong as the general chemical formula of coal is (C₃H₄)_x, which clearly states that it is a hydrogen-deficient hydrocarbon and has interlocked aromatic rings.

2. Which of the following statements regarding coal are correct?
a) Coking coals do not soften on heating
b) Non coking coals soften on heating
c) Coke is an oxidizing agent
d) Coal is a hydrogen deficient hydrocarbon

Answer: d
Clarification: Coking coals soften and non coking coals do not soften on heating. The product formed during heating of non coking coal is called char. Coke is a reducing agent as it is hydrogen deficient hydrocarbon.

3. Match the following?

 Raw material                                   Process
i. Light oil                             A. Gasification of coal
ii. Powdered coal                        B. Distillation of coal tar
iii. Coke                                C. Hydrogenation of coal

a) i-A, ii-B, iii-C
b) i-B, ii-A, iii-C
c) i-B, ii-C, iii-A
d) i-C, ii-B, iii-C

Answer: c
Clarification: Raw materials used in gasification of coal are coke or non coking coals, powdered coal is used in hydrogenation of coal, and distillation of coal tar uses light oil from coking process.

4. The gas from the oven in Coking process of coal is scrubbed with H₂S0₄ to remove ammonia. Is the statement true/false?
a) True
b) False

Answer: a
Clarification: The statement is true and the gas from the oven is cooled to remove tars, to remove aromatics it is scrubbed with light oil, scrubbed with sulfuric acid to remove ammonia leaving behind coal gas.

5. Which of the following way is used to fed hydrogenation processes in hydrogenation of coal?
a) Feeding the non powdered coal directly in presence of oxygen
b) By feeding paste of pulverized coal and heavy oil
c) Treating of non powered coal by solvent extraction
d) Feeding the non powdered coal directly along with stream of hydrogen

Answer: b
Clarification: Various ways used for feeding coal to hydrogenation processes are i. Treating powdered coal by solvent extraction and then feeding ii. By feeding paste of pulverized coal and heavy oil iii. Feeding powdered coal directly with stream of hydrogen.

6. Catalyst used in hydrogenation of coal is ___________________
a) Titanium oxide
b) Chromium oxide
c) Manganese oxide
d) Nickel

Answer: a
Clarification: 1% solution of Titanium oxide or molybdenum oxide is used as catalyst in hydrogenation of coal to impregnate the coal into reaction zone.

7. The inlet speeds of coal dust and oxygen blown into gasification chamber are _________ than the velocity of flame propagation
a) Higher
b) Lesser
c) Greater than or equal to
d) Less than or equal to

Answer: a
Clarification: The inlet speeds of coal dust and oxygen must be higher than velocity of flame propagation. Then at the base of chamber ash falls into water seal and hot gases escape through top of the chamber.

8. Which material of construction is used in reactor steels(hydrogenation of coal) to avoid hydrogen embrittlement?
a) Tool steel
b) Chromium-molybdenum steel
c) Stainless steel
d) Carbon steel

Answer: b
Clarification: Chromium-molybdenum steels are used as material of construction in reactor steels to avoid hydrogen embrittlement. Coal must be fed in powdered form into the hydrogenators reactor.