Question detail
In the context of the Haber process, what is the main reason for using air instead of pure nitrogen gas?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
The Haber process and the use of NPK fertilisers
Question
- A. Air contains catalysts that speed up the reaction
- B. Air is easier to compress than pure nitrogen
- C. Air is a cheaper source of nitrogen
- D. Air prevents the formation of unwanted by‑products
Answer
The correct option is Air is a cheaper source of nitrogen. This answer is correct because it matches the approved learning objective to recall air as a source of nitrogen for the Haber process. (Chemistry only) in the subtopic The Haber process.
Explanation
The correct option is Air is a cheaper source of nitrogen. Air is a cheaper source of nitrogen is correct because it directly supports the approved learning objective to recall air as a source of nitrogen for the Haber process. (Chemistry only). This belongs to the subtopic The Haber process within The Haber process and the use of NPK fertilisers, so the explanation must stay tied to that curriculum context. The other options are incorrect because they either do not answer this learning objective, use a vague statement, or move away from The Haber process.
Common mistake
Source of Nitrogen Confusion
Students often confuse air with nitrogen gas, thinking air is purely nitrogen.
Remember that air is a mixture of gases, with nitrogen being the main component but not the only one.
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