The correct option(s) related to the extraction of iron from its ore in the blast furnace operating in the temperature range $900-1500 K$ is(are)
- Limestone is used to remove silicate impurity.
- Pig iron obtained from blast furnace contains about $4 \%$ carbon.
- Coke (C) converts $CO _2$ to $CO$.
- Exhaust gases consist of $NO _2$ and $CO$.
The Correct Option is C
Approach Solution - 1
The correct option is (C): Coke (C) converts \(CO _2\) to \(CO\).
Approach Solution -2
Option (C) states that coke (\( \text{C} \)) converts carbon dioxide (\( \text{CO}_2 \)) to carbon monoxide (\( \text{CO} \)) in the blast furnace. This is indeed correct.
The overall reaction for this process is:
\[ \text{CO}_2 + \text{C} \rightarrow 2\text{CO} \]
This reaction occurs at high temperatures in the blast furnace, typically in the range of 900 K to 1500 K. It is an important step in the extraction of iron from its ore because carbon monoxide is a reducing agent that reacts with iron ore (\( \text{Fe}_2\text{O}_3 \)) to produce iron metal (\( \text{Fe} \)):
\[ \text{Fe}_2\text{O}_3 + 3\text{CO} \rightarrow 2\text{Fe} + 3\text{CO}_2 \]
Thus, option (C) accurately describes one of the key processes involved in the extraction of iron from its ore in the blast furnace.
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Concepts Used:
General Principles and Processes of Isolation of Elements
What are Ores and Minerals?
Minerals are the naturally occurring, homogeneous inorganic solid substances. They are having a definite chemical composition and crystalline structure, hardness and color. For example, copper pyrite, calamine, etc.
Impurities in an ore are called gauge. The removal of a gauge from the ore is called concentration ore.
Several steps are involved in the extraction of pure metal from ores. Major steps are as follows –
- Concentration of the ore
- Isolation of the metal from its concentrated ore
- Purification of the metal