250+ TOP MCQs on Inorganic Chemical – Ammonia and Answers

Chemical Industry Multiple Choice Questions on “Inorganic Chemical – Ammonia”.

1. Ammonia is used for which of the mentioned processes?
a) Manufacture of nitrogen fertilizers
b) Manufacture of nitric acid
c) Manufacture of nitrogen chemical compounds
d) All of the mentioned

Answer: d
Clarification: Nitrogen is abundantly available in atmosphere and reaction with hydrogen at specific conditions will give rise to ammonia, which is used in making fertilizers, nitric acid, and nitrogen chemical compounds like Nitrobenzene etc.

2. What is the molecular weight of Ammonia?
a) 17
b) 18
c) 19
d) 20

Answer: a
Clarification: The formula of Ammonia is NH₃, Weight of nitrogen is 14 and weight of hydrogen is 1.Weight of Ammonia is 14+ 3*1 = 17.

3. What are the boiling and melting points of Ammonia respectively?
a) -33.4 Celsius & -77.7 Celsius
b) -77.7 Celsius & -33.4 Celsius
c) -10.6 Celsius & -20.3 Celsius
d) None of the mentioned

Answer: a
Clarification: The boiling point of Ammonia is -33.4 Celsius and the melting point of Ammonia is -77.7 Celsius.

4. Which of the mentioned statements regarding the solubility of ammonia is true?
a) Insoluble in water
b) Highly Soluble in water
c) Soluble in Chloroform
d) Highly Soluble in water and soluble in Chloroform

Answer: d
Clarification: Ammonia is highly soluble in water and is soluble in solvents like chloroform, ether, ethanol, and methanol.

5. What is the catalyst used in manufacture of Ammonia by Haber’s process?
a) Fe
b) Molybdenum
c) Silica
d) Aluminum

Answer: a
Clarification: Fe is used as catalyst in the process of synthesis of ammonia by Haber’s process.

5. What is the promoter used in the manufacture of Ammonia by Haber’s process?
a) Fe
b) Molybdenum
c) Silica
d) Aluminum

Answer: b
Clarification: Molybdenum is used as catalyst promoter in synthesis of Ammonia by Haber’s process.

6. What is the temperature range at which the preheated gas flows through the inside of tube, which contains promoted iron catalyst?
a) 450-500 Celsius
b) 500-550 Celsius
c) 550-600 Celsius
d) 400-600 Celsius

Answer: b
Clarification: The preheated gas flows next through the inside of the tube, which contains promoted porous iron catalyst at 500-550 Celsius.

7. Synthesis of Ammonia by Haber’s process is what kind of reaction?
a) Exothermic
b) Endothermic
c) No change is energy
d) None of the mentioned

Answer: a
Clarification: The reaction that occurs is N₂ + 3H₂ which gives 2NH₃, The reaction is reversible with ΔH = -22.0 Kcal.

8. Which of the mentioned conditions will favor synthesis of Ammonia by Haber’s process?
a) High temperature and High pressure
b) Low temperature and High pressure
c) High temperature and Low pressure
d) Low temperature and Low pressure

Answer: b
Clarification: According to Le Chatlier principle forward reaction is favorable when pressure is high, i.e. equilibrium shifts to right, which gives more Ammonia. Since the reaction is exothermic, Low temperature will favor the reaction. So Low temperature and High-pressure favors the synthesis.

9. Which of the following mentioned is a source of H₂ to produce ammonia by Haber’s process?
a) Producer gas
b) Water gas
c) Synthesis gas
d) None of the mentioned

Answer: c
Clarification: Synthesis gas is used to obtain H₂ required for the process and N₂ from air addition in synthesis gas process.

10. Iron oxide catalyst if fused which of the mentioned promoters?
a) Alkali
b) Non-ferrous metal oxides
c) Al₂O₃
d) All of the mentioned

Answer: d
Clarification: NH₃ synthesis catalysts are based on iron oxide promoted by alkali or non ferrous metal oxides such as K₂O and Al₂O₃.