This set of Unit Processes Multiple Choice Questions & Answers (MCQs) focuses on “Introduction”.
1. What type of reaction is synthesis of hydrocarbon?
a) Exothermic
b) Endothermic
c) Neutral
d) None of the mentioned
View Answer
Explanation: Aliphatic hydrocarbons and oxygenated compounds can be synthesized from mixtures of hydrogen and carbon monoxide by reaction over suitable catalysts and are highly exothermic.
2. What is meant by hydroformylation reaction?
a) Reaction of olefins
b) Reaction of Azos
c) Reaction of aromatics
d) All of the mentioned
View Answer
Explanation: Hydroformylation is a reaction in which an olefin is reacted with a mixture of hydrogen and carbon monoxide.
3. In which process hydroformylation of olefin to an aldehyde occurs?
a) Azo process
b) Alkyl process
c) Oxo process
d) None of the mentioned
View Answer
Explanation: In the Oxo process, hydroformylation of the olefin to an aldehyde occurs by addition of a hydrogen atom and a formyl group to the double bond.
4. What compound(s) are removed during General Synthesis Scheme?
a) Solids
b) Sulphur compounds
c) Carbon dioxide
d) All of the mentioned
View Answer
Explanation: During general synthesis scheme gasification of coal with steam and oxygen is followed by a purification step to eliminate solids, sulphur compounds, and most of the carbon dioxide.
5. Why does synthesis scheme has two steps?
a) Low yield
b) Less energy
c) High conversion
d) All of the mentioned
View Answer
Explanation: Two stages of synthesis are employed to attain a high conversion of the synthesis gas.
6. Synthesis gas for the Fischer-Tropsch reaction consists of what?
a) Hydrogen
b) Carbon monoxide
c) Both H2 and CO
d) None of the mentioned
View Answer
Explanation: Synthesis gas for the Fischer-Tropsch reaction consists of mixtures of hydrogen and carbon monoxide in ratios of from O.7H2: 1CO to 2.5H2: 1CO.
7. What type of reaction is the production of H2 and CO?
a) Exothermic
b) Endothermic
c) Neutral
d) None of the mentioned
View Answer
Explanation: To produce hydrogen and carbon monoxide, the reaction is endothermic.
8. What is the use of water-gas generators?
a) Heating oils
b) Heating water
c) Heating gas
d) None of the mentioned
View Answer
Explanation: Water-gas generators have been widely used to make heating gas of about 300 Btu per cu ft as well as gas for the production of hydrogen to, be used in ammonia synthesis.
9. What are the catalyst poison purification of Synthesis Gas?
a) Hydrogen sulphide
b) Organic sulphur
c) All of the mentioned
d) None of the mentioned
View Answer
Explanation: Hydrogen sulphide and organic sulphur are catalyst poisons and must be removed to an extremely low value, generally less than 0.1 grain of total sulphur per 100 cu ft of gas.
10. Why do we use Rectisol process?
a) Purification
b) Hydrogenation
c) All of the mentioned
d) None of the mentioned
View Answer
Explanation: Method of gas purification is the Rectisol process used in the South African plant. This process is based on the physical solubility of impurities in a methanol solution at – 40 to – 60°C.
Sanfoundry Global Education & Learning Series – Unit Processes.
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