This set of Iron Making Multiple Choice Questions & Answers (MCQs) focuses on “Physical Chemistry of Blast Furnace Reactions”.
1. What is the source of the principal reducing agent in Blast furnace?
a) Coke
b) Limestone
c) Ironore
d) Silica
View Answer
Explanation: Carbon is the principal reducing agent used in B.F. The principal source of carbon is Coke. So, the principal source of reducing agent in blast furnace is Coke.
2. Which of the following conversion is more preferable in the blast furnace combustion reactions at low temperatures?
a) C + O2—– CO2
b) C + 0.5O2—– CO
c) 2C + 2O2—– 2CO2
d) C + 0.5O2—– 2CO2
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Explanation: The combustion of carbon is carried in blast furnace to form CO and CO2. The heat release is more in the formation of CO compared to formation of CO2. So carbondioxide formation is possible to maximum extent and more preferable.
3. What is the value of activity for pure carbon?
a) 1
b) 2
c) 3
d) 4
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Explanation: Activity for gaseous species is equal to their partial pressures. In this case the activity for solids and for pure carbon is 1. This activity value is used to calculate other required parameters in chemical reactions.
4. Which region holds the complete O2 usage in the Blast furnace?
a) Stack region
b) Belly region
c) Bosh region
d) Tuyere region
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Explanation: Oxygen is entered into the furnace through tuyeres. This oxygen is completey used in combustion reactions with carbon. The complete oxygen is used to form CO and CO2 and the left over oxygen for upper regions is negligible.
5. Which of the following reactions is called as boudouard reaction?
a) CO2 + C → 2CO
b) CO + 2C → CO
c) CO + 2O → CO2
d) CO2 + 2O → 2CO2
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Explanation: CO2 + C → 2 CO is the gasification reaction carried in blast furnace. This reaction is also called as Solution loss reaction. Gassification of carbon with carbon dioxide is termed as boudouard reaction.
6. Which of the following is the stable oxide at higher temperatures in blast furnace?
a) CO
b) CO2
c) MnO
d) SiO2
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Explanation: At higher temperatures, in the blast furnace CO is the stable oxide. At tuyere zone compared to CO2, CO is more stable. With increase in temperature its stability increases as in Fe-C-O system.
7. Coke is a mechanical mixture of _______
a) Carbon and ash
b) Carbon and soda
c) Carbon and coal
d) Coal and silica
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Explanation: Coke is the principle source of reducing agent in blast furnace. Coke is the mechanical mixture of carbon and ash. This mixture also consists of negligible amount of inorganic compounds.
8. Which of the following region sof B.LF is also called as Shaft?
a) Stack
b) Belly
c) Bosh
d) Hearth
View Answer
Explanation: Stack region is also called as Shaft in Blast furnace. There are 4 regions in blast furnace according to physical appearance. They are Stack,Belly,Bosh,Hearth.
9. The sum of partial pressure of CO and CO2 at equilibrium is __________
a) 1
b) 2
c) 3
d) 4
View Answer
Explanation: The sum of partial pressures of CO and CO2¬ is equal to the total pressure in CO-CO2 equilibrium. This total pressure is equal to 1. So sum of partial pressures of CO and CO2 is equal to 1.
10. What is the free energy change reaction for CO2 + C—- 2CO (G3), If G1 is for CO2 formation and G2 is for combustion reaction to form CO?
a) G3 = 3G2 – 2G1
b) G3 = G2 – 2G1
c) G3 = 2G2 – 3G1
d) 2G3 = 2G2 – G1
View Answer
Explanation: The formation of CO2reaction is C + O2 =CO2 . Formation of CO through combustion is by C + 0.5O2 =CO. thus by equalizing and computating 2G3 = 2G2 – G1 is obtained.
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