Which reaction occurs at X?

Question

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21) When sulphuric acid ( $\text{H}_2\text{SO}_4$ ) reacts with a base, the salt formed will contain the sulphate ion ( $\text{SO}_4^{2-}$ ). Therefore, the salt formed is a sulphate.

The correct option is C.

24) Point X in the blast furnace diagram indicates the region where hot air (containing oxygen) is blown into the furnace. In this region, coke (carbon) reacts with the oxygen to produce carbon dioxide and a large amount of heat, which is essential for the process.

Identify the location X in the blast furnace.
Location X is at the bottom of the blast furnace, where hot air is introduced. This is the zone of highest temperature.
Determine the primary reaction occurring at this location.
At the bottom of the blast furnace, coke (carbon) reacts with the incoming hot oxygen from the air. This combustion reaction produces carbon dioxide and releases significant heat.
$\text{C(s)} + \text{O}_2\text{(g)} \to \text{CO}_2\text{(g)}$
Compare this reaction with the given options.
- A: carbon + oxygen $\to$ carbon dioxide. This matches the reaction described in Step 2.
- B: carbon dioxide + oxygen $\to$ carbon monoxide. This is incorrect; carbon dioxide reacts with carbon to form carbon monoxide.
- C: iron (III) oxide + slag $\to$ carbon monoxide + iron. This is incorrect; slag is a byproduct, and iron (III) oxide is reduced by carbon monoxide.
- D: iron (III) oxide + carbon monoxide $\to$ carbon dioxide + iron. This is the main reduction reaction, which occurs higher up in the furnace, not at X.
The correct option is A.

The final answers are $\boxed{\text{21: C, 24: A}}$ .

Which reaction occurs at X?

Answer

Step-by-step solution

Identify the location X in the blast furnace.

Determine the primary reaction occurring at this location.

Compare this reaction with the given options.

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