Engineering Questions with Answers - Multiple Choice Questions

Unit Processes MCQ’s – Technical Manufacturing of Amino Compound – 1

1 - Question

Ammonia is manufactured by addition of H2 to N2 on which catalyst?
a) Cu
b) Zn
c) Fe
d) Al
View Answer Answer: c
Explanation: Most of the world’s ammonia supply is manufactured by the addition of hydrogen to nitrogen over an iron-based catalyst at elevated temperatures and pressures.

2 - Question

The reaction of H2 to N2 is highly ______. Fill in the blank.
a) Endothermic
b) Exothermic
c) Neutral
d) None of the mentioned
View Answer Answer: b
Explanation: The reaction of ‘nitrogen with hydrogen to form ammonia is a highly exothermic reaction. According to Le Chatelier.

3 - Question

What happens to equilibrium as temperature increases?
a) Increases
b) Decreases
c) Remains constant
d) None of the mentioned
View Answer Answer: b
Explanation: The amount of ammonia formed at equilibrium decreases as the temperature is increased and increases as the pressure is increased, in accordance with the Le Chatelier Braun principle.

4 - Question

What is the stoichiometric ratio of N2 to H2?
a) 1:1
b) 1:2
c) 1:3
d) 3:1
View Answer Answer: c
Explanation: To obtain maximum conversion percentages at the selected operating pressures and temperatures, the law of mass action dictates that nitrogen and hydrogen be kept at the stoichiometric ratio of 1:3 and that gases which would cause lower partial pressures of the reactants should not be present.

5 - Question

Which gas is very important for the synthetic ammonia manufacture?
a) Synthesis gas
b) Nitrogen gas
c) Hydrogen gas
d) All of the mentioned
View Answer Answer: a
Explanation: Highly purified synthesis gas is a prime requirement for synthetic ammonia manufacture, and since its nitrogen content originates from air, hydrogen is the more costly component.

6 - Question

Complete the following reaction: CH4 + H2O —-> ____ + 2H2O.
a) CO
b) CO2
c) O2
d) None of the mentioned
View Answer Answer: a
Explanation: Natural gas is the major source of hydrogen, the reaction is as follows: CH4 + H2O —-> CO + 2H2O.

7 - Question

Formation of HCN from NH3, CH4 and O2 reacts on which catalyst?
a) Zinc
b) Iron
c) Platinum
d) All of the mentioned
View Answer Answer: c
Explanation: The synthesis of HCN from ammonia, methane (natural gas), and air. The over-all reaction CH4 + NH3 + 1.5 O2—–>HCN + 3H20 can be carried out effectively at about 1000°C over platinum-alloy screen catalysts.

8 - Question

To achieve optimum yield in synthesis of HCN, oxygen should be in excess.
a) True
b) False
View Answer Answer: b
Explanation: In order to obtain optimum yields, it is necessary to use less oxygen (as air) than the amount shown in the above equation, to prevent excessive oxidation of ammonia to nitrogen oxides and methane to carbon oxides.

9 - Question

Chlorobenzene in presence of NH3 gives what?
a) Aniline
b) Benzene
c) Phenol
d) HCl
View Answer Answer: a
Explanation: C6H5-Cl + NH3—–> C6H5-NH2 + HCl.

10 - Question

Why should we increase the ratio of NH3 in the above reaction?
a) Better yield
b) Aniline production
c) Good quality d) All of the mentio
View Answer Answer: d
Explanation: An increase in the NH3 ratio results in: (1) a better yield of aniline, (2) an increase in the ratio of aniline to phenol, and (3) a slight diminution in the yield of diphenylamine.

11 - Question

What is the name of the following compound: C6H5-NHCH3 ?
a) Methylebenzo
b) Methyleamine
c) Methylaniline
d) Aniline
View Answer Answer: c
Explanation: The compound name is methylaniline, as methyl group -CH3 is attached to the amine group.

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