This set of Unit Processes Multiple Choice Questions & Answers (MCQs) focuses on “Preparations”.
1. Amyl alcohols are prepared from what?
a) Chloropentanes
b) Chlorohexane
c) Chloroethane
d) None of the mentioned
View Answer
Explanation: Preparation of Amyl Alcohols from Chloropentanes.
2. Chlorination of pentane gives which type of chloride in preparation of amyl chloride?
a) Primary
b) Secondary
c) Tertiary
d) All of the mentioned
View Answer
Explanation: Two pentanes (normal and iso) serve as starting products for chlorination, and these give rise to primary, secondary, and tertiary chlorides.
3. The cracking of what produces olefin gases?
a) Fats
b) Petroleum
c) Amide
d) None of the mentioned
View Answer
Explanation: The cracking of petroleum, especially vapour-phase cracking, produces tremendous volumes of olefin gases, which are now extensively used as raw materials for alcohol production.
4. How is complex olefin produced?
a) High pressure
b) High temperature
c) Low temperature
d) None of the mentioned
View Answer
Explanation: The more complex the olefin, the lower the temperature and pressure at which reaction will take place.
5. How to increase the yield of alcohol?
a) High pressures
b) Dilute acid
c) High temperature
d) All of the mentioned
View Answer
Explanation: Some processes use dilute acid under high pressures, an increased yield of alcohol being obtained with a corresponding decreased yield of ether.
6. What is produced in ‘The Shell Process’?
a) Methanol
b) Ethanol
c) Propanol
d) All of the mentioned
View Answer
Explanation: The Shell Process.2 The production of ethanol by the direct addition of water to ethylene is being carried out successfully on a commercial scale.
7. What catalyst is used in Shell process?
a) Nickel
b) Xanthium
c) Aluminium
d) Celite
View Answer
Explanation: In the Shell process a phosphoric acid-on Celite catalyst is used in the reaction.
8. What condition is/are favourable for hydration of ethylene?
a) High pressure
b) Low temperature
c) High steam: ethylene ratios
d) All of the mentioned
View Answer
Explanation: The direct hydration of ethylene is an equilibrium reaction which is favoured by low temperatures, high pressures, and high steam: ethylene ratios.
9. What happens to the catalytic activity as temperature increases?
a) Increases
b) Decreases
c) No change
d) None of the mentioned
View Answer
Explanation: The catalytic activity of the phosphoric acid catalyst increases with increasing temperature, decreases with increasing pressure because of lower concentration, and decreases with high steam: ethylene ratios at high pressures because of moisture absorption.
10. The equilibrium concentration of ethyl alcohol decreases with an increase in temperature.
a) True
b) False
View Answer
Explanation: The equilibrium concentration of ethyl alcohol decreases rapidly with an increase in temperature while the activity of the catalyst increases.
11. The ethylene purity is a function of what?
a) Feed purity
b) Vent rate
c) Both feed purity and vent rate
d) None of the mentioned
View Answer
Explanation: The ethylene purity in the recycle is a function of feed purity and vent rate.
12. What is prepared when propylene is chlorinated?
a) Alkyl chloride
b) Allyl chloride
c) Aromatic chloride
d) None of the mentioned
View Answer
Explanation: When propylene is chlorinated at temperatures above 200°C, yields of 85-90 per cent of ally I chloride are obtained.
Sanfoundry Global Education & Learning Series – Unit Processes.
To practice all areas of Unit Processes, here is complete set of 1000+ Multiple Choice Questions and Answers.
- Check Unit Processes Books
- Check Chemical Engineering Books
- Apply for Chemical Engineering Internship
- Practice Chemical Engineering MCQs
