1. Which catalyst is used in the reaction of acetylene and chlorine producing tetra chloro ethane?
a) Barium chloride
b) Ferric chloride
c) Hydrogen chloride
d) Calcium chloride
Explanation: Ferric chloride is used as catalyst in the reaction of acetylene and chlorine to give tetra chloro ethane whereas barium chloride is used as catalyst in the reaction to produce tri chloro ethylene from tetra chloro ethane.
2. Acid free grade of tri chloro ethylene is known as _______________
a) Extraction
b) Technical
c) Industrial
d) Tri-chlor
Explanation: Acid free grade of tri chloro ethylene is known as tri-chlor whereas high purity grade is called technical grade and non-acid grade is called extraction grade, industrial grade is not present.
3. Which of the following chemical reaction is true?
a) \(C_2 H_2+ 2Cl_2 \, ^{\underrightarrow{BaCl_2}}\, C_2 H_2 Cl_2\)
b) \(C_2 H_2+ 2Cl_2 \, ^{\underrightarrow{BaCl_2}}\, C_2 H_2 Cl_4\)
c) \(C_2 H_2 Cl_4 \, ^{\underrightarrow{BaCl_2}}\, C_2 HCl_3+ HCl \)
d) \(C_2 H_2 Cl_4 \, ^{\underrightarrow{FeCl_3}}\, C_2 HCl_3+ HCl\)
Explanation:The correct chemical equation is \(C_2 H_2 Cl_4 \, ^{\underrightarrow{BaCl_2}}\, C_2 HCl_3+ HCl \) as Ferric chloride is used as catalyst in the reaction of acetylene and chlorine to give tetra chloro ethane whereas barium chloride is used as catalyst in the reaction to produce tri chloro ethylene from tetra chloro ethane.
4. What is the molecular weight of per chloro ethylene?
a) 166
b) 165
c) 154
d) 152
Explanation:Molecular formula of tri chloro ethylene is Cl2C=CCl2. As it contains 4 chlorine atoms, and 2 carbon atoms the molecular weight is 35.5*4+12*2=166.
5. Per chloro ethylene is miscible with alcohols and ethers.
a) True
b) False
Explanation: Per chloro ethylene is slightly soluble in water and it is not miscible with water. It is miscible with ethers and alcohols. It is available in technical grade form only.
6. Which type of electrode furnace is used in pyrolysis of carbon tetrachloride?
a) Carbon electrode furnace
b) Zinc electrode furnace
c) Aluminum electrode furnace
d) Iron electrode furnace
Explanation:Carbon electrode furnace is used in pyrolysis of carbon tetra chloride. Pyrolysis products are hexa chloro ethane, per chloro ethylene, and chlorine along with unreacted carbon tetra chloride.
7. Which of the following is one of the pyrolysis products of CCl4?
a) Tetra chloro ethane
b) Tri chloro ethane
c) Per chloro ethane
d) Hexa chloro ethane
Explanation: Hexa chloro ethane is one of the pyrolysis products of carbon tetra chloride. The other products are per chloro ethylene and chlorine with some unreacted carbon tetra chloride.
8. Which of the following statements regarding contact time in pyrolysis furnace design are true?
a) Hexa chlor yields are high at low contact time
b) Destructive formation of carbon takes place at low contact time
c) Hexa chlor yields are high, if the contact time is large
d) Destructive formation of light ends takes place when the contact time is low
Explanation: When the contact time is low, hexa chlor yields are high and when contact time is large, destructive formation of light ends and carbon takes place in pyrolysis furnace design.
9. Ethylene can be obtained from ____________________
a) Calcium carbide
b) Partial oxidation of petroleum fractions
c) Hydrogen steam cracking
d) Thermal pyrolysis of ethane
Explanation:Thermal pyrolysis of ethane is not a feasible method for producing ethylene. Acetylene can be obtained from calcium carbide and partial oxidation of petroleum fractions. Hydrogen steam cracking produces both ethylene and acetylene.
10. Which of the following statements are true?
a) Ethylene is highly soluble in water
b) Glycol is used in paint emulsions
c) Aromatics are not produced during steam cracking of hydrocarbons
d) Acetylene is more acidic than ethylene
Explanation: Ethylene is slightly soluble in water. Glycol is used as antifreeze but not in paint emulsions. Some of the aromatics are produced as by-products in the steam cracking of hydrocarbons. Acetylene is more acidic than ethylene due to strong overlapping between s and p orbital’s.