250+ TOP MCQs on Inorganic Chemical – Oxygen and Nitrogen and Answers

Chemical Industry Multiple Choice Questions on “Inorganic Chemical – Oxygen and Nitrogen”.

1. What is the molecular weight of Oxygen?
a) 30
b) 31
c) 32
d) 33

Answer: c
Clarification: Atomic weight of Oxygen is 16, Therefore the weight of O₂ molecule is 2(16) = 32.

2. What is the molecular weight of Nitrogen?
a) 25
b) 26
c) 27
d) 28

Answer: d
Clarification: Atomic weight of Nitrogen is 14.Therefore the weight of N₂ molecule is 2(14) = 28.

3. Which of the mentioned purposes uses High purity oxygen?
a) Welding and cutting of metals
b) Open hearth steel purification
c) Medicinal purposes
d) All the mentioned

Answer: d
Clarification: High purity oxygen is used for welding and cutting metals, open-hearth steel purification and medicinal purposes.

4. Which oxygen is used for blast furnace operations?
a) High purity oxygen
b) Low purity oxygen
c) Atmospheric oxygen
d) Liquid oxygen

Answer: b
Clarification: Low purity oxygen is used for Blast furnace operations.

5. Which of the mentioned gas is used as protective atmosphere to prevent oxidation in metalworking and food preservation?
a) N₂
b) O₂
c) H₂
d) CO₂

Answer: a
Clarification: Nitrogen is used to prevent oxidation in metalworking and food preservation due to its inertness.

6. Refrigeration by Joule-Thomson cooling is termed as which of the mentioned cycles?
a) Linde
b) Claude
c) Newton
d) None of the mentioned

Answer: a
Clarification: Linde cycle uses refrigeration by Joule-Thomson cooling.

7. Refrigeration by adiabatic expansion of compressed air in a rotating expansion machine is termed as which of the mentioned cycles?
a) Linde
b) Claude
c) Newton
d) None of the mentioned

Answer: b
Clarification: Claude cycle obtains refrigeration by adiabatic expansion of compressed air in a rotating expansion machine.

8. What type of oxygen is used for oxidation of hydrocarbons?
a) Low purity oxygen
b) High purity oxygen
c) Atmospheric oxygen
d) Liquid oxygen

Answer: a
Clarification: Low purity oxygen is used for oxidation of hydrocarbons into CO₂ and H₂O.

9. How much percentage of oxygen is present in High purity oxygen?
a) 90.5
b) 93.5
c) 95.5
d) 99.5

Answer: d
Clarification: The composition of high purity oxygen is 99.5% O₂ and 0.5% Ar.

10. What is the boiling point of nitrogen?
a) -190 Celsius
b) -192 Celsius
c) -195.8 Celsius
d) -200 Celsius

Answer: c
Clarification: Boiling point of nitrogen is -195.8 Celsius.