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?
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
d) Carbon tetra chloride
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
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
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 ____________
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
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
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.