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.
Top Questions on General Principles and Processes of Isolation of Elements
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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
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