Engineering Questions with Answers - Multiple Choice Questions
Chemical Industry MCQ’s – Inorganic Chemical – Electroorganic Chemicals
1 - Question
Steps involved in formation of adiponitrile are _______
a) Benzene → adipic acid → cyclohexane → adiponitrile
b) Cyclohexane → benzene → adipic acid → adiponitrile
c) Benzene → cyclohexane →adipic acid → adiponitrile
d) Cyclohexane → adipic acid → benzene → adiponitrile
View Answer
Explanation: Benzene on reduction gives cyclohexane, which further t forming adipic acid. Adipic acid on dehydration in presence of ammonia forms an amide which on dehydration produces adiponitrile.
2 - Question
Which of the following reaction takes place at cathode in electro chemical manufacture of adiponitrile from acrylonitrile?
a) H2O →2H++12 O2+ 2e–
b) 2CH2=CHCN+2H2 O+2e–→NC – (CH2)4 – CN
c) 2CH2=CHCN+2H2 O+2e–→NC – (CH2)4 – CN+2OH–
d) 2CH2=CHCN+2H2 O→NC – (CH2)4 – CN+12 O2
View Answer
Explanation: Reaction H2O →2H++12 O2+ 2e– takes place at anode since it is an oxidation reaction. In the reaction 2CH2=CHCN+2H2O + 2e– → NC-(CH2)4-CN, charge is unbalanced. Reaction 2CH2=CHCN+2H2O+2e–→NC-(CH2)4-CN+2OH– takes place at cathode.
3 - Question
Cathode used in electro chemical manufacture of adiponitrile from acrylonitrile is ____________
a) Titanium
b) Platinum-coated carbon
c) Graphite
d) Lead
View Answer
Explanation: The electrochemical cell uses platinum-coated carbon or titanium as anode and lead as cathode. Anode and cathode are separated by permeable membrane.
4 - Question
Anolyte used in electro chemical manufacture of adiponitrile from acrylonitrile is ______________
a) Lead
b) Sulfuric acid
c) Titanium
d) Ammonium salt solution
View Answer
Explanation: Lead is used as cathode; Titanium is used as anode, quaternary ammonium salt solution as catholyte, and sulfuric acid as anolyte. For anolyte and catholyte, separate fluid circulating systems are maintained.
5 - Question
Which of the following raw material is not used in production of tetra ethyl lead (TEL) by electro chemical process?
a) Lead metal
b) Magnesium chloride
c) Ethyl chloride
d) Ethyl magnesium chloride
View Answer
Explanation: Reaction 2C2H5 MgCl+2C2H5 Cl+Pb →Pb(C2H5)4 + 2MgCl2 is involved in the production of tetra ethyl lead. Hence the raw materials required are lead metal, ethyl chloride, and ethyl magnesium chloride.
6 - Question
Which of the following acts as cathode in production of tetra ethyl lead (TEL) by electro chemical process?
a) Lead
b) Titanium
c) Stainless steel
d) Paltinum
View Answer
Explanation: Electrolytic cells in production of tetra ethyl lead (TEL) uses lead as anode and stainless steel as cathode where the electrolyte has Grignard reagent along with suitable solvents.
7 - Question
Grignard reagent is used in production of tetra ethyl lead (TEL) by electro chemical process. Is the statement true/false?
a) False
b) True
View Answer
Explanation: Ethyl magnesium chloride (C2H5 MgCl) is used in the production of tetra ethyl lead (TEL) by electro chemical process which means Grignard reagent is used.
8 - Question
Shorting of cell in production of tetra ethyl lead (TEL) is prevented by adding __________
a) Excess Grignard reagent
b) Excess C2H5Cl
c) Excess Mg
d) Excess MgCl2
View Answer
Explanation: Eliminated magnesium metal is deposited at cathode bridging the gap between electrodes which leads to shorting of cell. Hence excess C2H5Cl is added as reacts with magnesium forming Grignard reagent.
9 - Question
Which of the following acts as thermal stabilizer for tetra ethyl lead?
a) Diethyl ether
b) Tetra hydro furan
c) Aromatic hydrocarbon
d) Ethyl magnesium chloride
View Answer
Explanation: Tetra hydro furan and diethyl ether are used to increase conductivity, ethyl magnesium chloride (Grignard reagent) is a raw material for production of tetra ethyl lead, and aromatic hydrocarbon is used as thermal stabilizer for TEL.