Engineering Questions with Answers - Multiple Choice Questions

Chemical Technology MCQ’s – C2 Compounds – Vinyl Chloride

1 - Question

What is the molecular weight of vinyl chloride?
a) 63
b) 62.5
c) 64
d) 63.5
View Answer Answer: b
Explanation: Chemical formula of vinyl chloride is CH2=CHCl. It contains 2 carbon atoms, 3 hydrogen atoms, and 1 chlorine atom with 12, 1, and 35.5 as their atomic weights respectively. Hence the molecular weight is 12*2+3*1+35.5*1=62.5.

2 - Question

Vinyl chloride is least soluble in __________________
a) Diethyl ether
b) Water
c) Alcohols
d) Carbon tetra chloride
View Answer Answer: b
Explanation: Vinyl chloride with molecular weight 62.5 is slightly soluble in water but it is soluble in diethyl ether, carbon tetra chloride, and alcohols. It is available in polymer grade (99% pure).

3 - Question

Which reagent is used for drying ethylene dichloride in the manufacturing process of vinyl chloride?
a) Calcium Carbonate
b) Sodium sulfate
c) Silica gel
d) Sulfuric acid
View Answer Answer: c
Explanation: Silica gel (desiccant) is the reagent used to dry ethylene dichloride, which on undergoing thermal pyrolysis produces vinyl chloride along with hydrochloric acid.

4 - Question

Which type of furnace is used for production of vinyl chloride?
a) Blast furnace
b) Tubular Cracking furnace
c) Condensing furnace
d) Modulating furnace
View Answer Answer: b
Explanation: Vaporized ethylene dichloride dried with silica gel is introduced into tubular cracking furnace where thermal pyrolysis of ethylene dichloride takes place. Products are vinyl chloride and hydrochloric acid.

5 - Question

Contact surface catalyst used in cracking furnace (vinyl chloride manufacture) within the tubes is ____________
a) Charcoal
b) Anthracite
c) Coke
d) Lignite
View Answer Answer: a
Explanation: Charcoal or pumice is used as contact surface catalyst within the tubes in tubular cracking furnace. 50% conversion and 95-96% yield are obtained.

6 - Question

What are the operating conditions of ethylene dichloride thermal pyrolysis reaction?
a) 500°C, 4 atm
b) 250°C, 4 atm
c) 500°C, 2 atm
d) 250°C, 2 atm
View Answer Answer: a
Explanation: Thermal pyrolysis reaction of ethylene dichloride is operated at a temperature of 500°C and a pressure of 4 atm. Increase in temperature increases carbon formation which is not favorable.

7 - Question

Catalyst used in acetylene-HCl reaction is ___________
a) Zinc pellets
b) Carbon pellets
c) Iron pellets
d) Graphite
View Answer Answer: b
Explanation: Carbon pellets impregnated on mercurous chloride is used as catalyst in acetylene-HCl reaction. Temperature is maintained at 160°C and it increases as catalyst deteriorates.

Get weekly updates about new MCQs and other posts by joining 18000+ community of active learners